Abiotic Nonliving

abl An oncogene identified in Abelson murine leukaemia virus that encodes a non-receptor tyrosine kinase, abl. c-Abl contains both a G-actin-binding site and an independent F-actin site. See also ABLV and Table O1.

ABLV The Abelson murine leukaemia virus, a mammalian retrovirus. Its transforming gene, abl, encodes a protein with tyrosine kinase activity closely related to src.

ABM paper Aminobenzyloxy methylcellulose paper: paper to which single-stranded nucleic acid can be cova-lently coupled.

ABO blood group system Probably the best known of the blood group systems, involves a single gene locus that codes for a fucosyl transferase. If the H-gene is expressed then fucose is added to the terminal galactose of the precursor oligosaccharide on the red cell surface and the A- or

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