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Aplacophora
Aplacophora is a clade of worm-shaped, shell-less marine molluscs whose bodies are covered in calcareous sclerites, comprising the two classes Solenogastres and Caudofoveata, the sister group of the chitons.
Aplasia cutis congenita
Aplasia cutis congenita (ACC) is a rare congenital absence of skin, usually a solitary scalp vertex lesion, prevalence about 1/10,000 births; classified by Frieden into nine groups, linked to methimazole exposure and Adams-Oliver syndrome.
Aplasia of lacrimal and salivary glands
Aplasia of lacrimal and salivary glands (ALSG, OMIM 180920) is a rare autosomal dominant disorder of FGF10 haploinsufficiency causing absent or underdeveloped tear and salivary glands, with dry eyes, xerostomia, and dental caries from infancy.
Aplastic anemia
Aplastic anemia, or bone marrow failure, is a rare immune-mediated disorder causing pancytopenia and hypocellular marrow. Treated with ATG plus cyclosporine, eltrombopag, or allogeneic stem cell transplant; incidence 0.7-4.1 per million yearly.
Aplastic anemia-intellectual disability-dwarfism syndrome
Aplastic anemia-intellectual disability-dwarfism syndrome, or AMeD syndrome (OMIM 619151), a rare autosomal recessive digenic ADH5/ALDH2 disorder causing formaldehyde accumulation, bone marrow failure, short stature, microcephaly, and leukemia predisposition.
Aplodontia
Aplodontia, also called sewellel, is a genus of burrowing rodents containing one living species, the mountain beaver, a tailless-looking rodent of western North America related to squirrels.
Aplousobranchia
Aplousobranchia is an order of colonial ascidians (sea squirts) with the simplest branchial sac and gut loop below it, defined by Lahille (1886) alongside Phlebobranchia and Stolidobranchia; all species are colonial, with zooids divided into thorax, abdomen, and post-abdomen.
APLP2
APLP2 (amyloid beta precursor like protein 2, HGNC:598, 11q24.3) is a human type I transmembrane APP family protein lacking the Aβ sequence, functionally redundant with APP in synapses, ubiquitously expressed, and implicated in pancreatic cancer progression.
Aplysia vaccaria
Aplysia vaccaria, the California black sea hare, is a large shell-less sea slug of the Pacific coast of North America and the largest sea slug in the Eastern Pacific.
Aplysina aerophoba
Aplysina aerophoba, the Mediterranean golden yellow tube sponge (Verongiida, Aplysinidae), turns black when collected, stores brominated isoxazoline alkaloids up to 10% dry weight, and converts them to antibiotic aeroplysinin-1 upon wounding.
APM Terminals
APM Terminals is an international container terminal operator headquartered in The Hague, Netherlands, and a business unit of the Danish shipping group A.P. Moller–Maersk, established in 2001.
Apna Sangeet
Apna Sangeet is a Birmingham-based British bhangra band formed in the 1980s, led by KS Bhamrah and Sardara Gill, and known for the anthem "Apna Sangeet Vaje Apna Sangeet".
Apnapan (अपनापन)
Apnapan (अपनापन) is a 1977 Hindi drama-romance directed and produced by J. Om Prakash, starring Jeetendra, Reena Roy, and Sulakshana Pandit, with music by Laxmikant-Pyarelal and lyrics by Anand Bakshi; also known internationally as Kinship.
Apne (अपने)
Apne (अपने) is a 2007 Hindi sports drama directed by Anil Sharma, the first film starring Dharmendra with sons Sunny and Bobby Deol as a disgraced boxer's family; released 29 June 2007, IMDb 6.1, average box office.
Apnea
Apnea, from Greek apnous (breathless), is a temporary cessation of breathing; recurrent sleep apnea occurs as obstructive (airway collapse) or central (lost brain signaling) types, scored as ≥90% airflow drops lasting ≥10 seconds, treated mainly with CPAP.
Apnea of prematurity
Apnea of prematurity (AOP) is a developmental disorder in preterm infants, defined by breathing pauses of 20 seconds or longer. It is commonly treated with caffeine and CPAP.
APNG
APNG, short for Animated PNG, is a PNG extension adding frame-based animation with 24-bit color and 8-bit transparency, created at Mozilla in 2004 and standardized in 2025.
Apnimed, Inc.
Apnimed, Inc. is a Cambridge, Massachusetts pharmaceutical company developing AD109 (Oxnimbi), a once-daily oral pill for obstructive sleep apnea, with an FDA decision expected in 2027.
Apnoea
Apnoea (American spelling apnea) is the temporary cessation of breathing. In clinical medicine it chiefly means repeated breathing pauses during sleep, divided into obstructive, central, and mixed types.
APOA1
APOA1 (apolipoprotein A1 gene, 11q23.3) encodes apoA-I, the major HDL protein and LCAT cofactor; variants cause familial HDL deficiency, amyloidosis, and altered myocardial infarction risk.
APOA4
APOA4 encodes apolipoprotein A-IV, a small-intestine-derived, chylomicron-associated apolipoprotein at 11q23.3 involved in lipid absorption, satiety, reverse cholesterol transport, and glucose homeostasis.
APOA5
APOA5 (apolipoprotein A5, APOA-V) is a liver-expressed human gene on chromosome 11q23.3, discovered in 2001, encoding a ~39 kDa apolipoprotein that activates lipoprotein lipase and lowers plasma triglycerides; loss-of-function variants cause hypertriglyceridemia.
APOB-related familial hypobetalipoproteinemia
APOB-related familial hypobetalipoproteinemia (APOB-FHBL, FHBL1, OMIM 615558) is a codominant disorder caused by APOB gene variants, causing very low LDL cholesterol and apoB; biallelic cases show fat malabsorption, vitamin deficiency, and fatty liver.
APOBEC1
APOBEC1, also called C-to-U-editing enzyme APOBEC-1, is a human cytidine deaminase encoded on chromosome 12 that edits apolipoprotein B mRNA, producing the truncated apoB48 protein.
APOBEC3B
APOBEC3B (A3B) is a human APOBEC3 family cytidine deaminase that deaminates cytosine to uracil in single-stranded DNA, restricting viruses but driving SBS2/SBS13 mutagenesis, tumor evolution, and therapy resistance in cancers such as breast and ovarian cancer.
APOBEC3F
APOBEC3F (A3F) is a human cytidine deaminase on chromosome 22q13.1, one of seven APOBEC3 genes, that restricts HIV-1 by C-to-U editing of viral DNA, prefers TTC motifs, and is counteracted by Vif.
APOBEC3G
APOBEC3G, also called A3G and formerly CEM15, is a human enzyme on chromosome 22 that deaminates cytosine in single-stranded DNA, blocking HIV-1 unless the viral Vif protein degrades it.
APOC3
APOC3 (apolipoprotein C-III gene, chromosome 11q23.2) encodes a 79-amino-acid glycoprotein on VLDL, HDL, and chylomicrons that inhibits lipoprotein lipase and raises triglycerides; loss-of-function mutations lower cardiovascular risk, and olezarsen and plozasiran target it.
Apocalypse
An apocalypse, from the Greek apokalypsis meaning "uncovering," is a work of revelatory literature in which divine secrets about the end times are disclosed to a human recipient.
Apocalypse (character)
Apocalypse (En Sabah Nur) is Marvel Comics' ancient mutant conqueror, debuting in X-Factor #5-6 (1986), created by Louise Simonson and Jackson Guice, leader of the Four Horsemen and villain of Age of Apocalypse, X-Men '97, and the 2016 film.