Interacting selectively with a nucleotide, any compound consisting of a nucleoside that is esterified with (ortho)phosphate or an oligophosphate at any hydroxyl group on the ribose or deoxyribose moiety [goid 166] [evidence IEA]; Interacting selectively with double-stranded DNA [goid 3690] [pmid 6325948] [evidence NAS];  [goid 4710] [pmid 15542601] [evidence NAS]; Combining with an extracellular or intracellular messenger to initiate a change in cell activity, and spanning to the membrane of either the cell or an organelle [goid 4888] [pmid 7736574] [evidence IDA]; Combining with an epidermal growth factor to initiate a change in cell activity [goid 5006] [evidence IEA]; Combining with an epidermal growth factor to initiate a change in cell activity [goid 5006] [pmid 12435727] [evidence IDA]; Combining with an epidermal growth factor to initiate a change in cell activity [goid 5006] [pmid 6325948] [evidence NAS]; Combining with an epidermal growth factor to initiate a change in cell activity [goid 5006] [pmid 2790960] [evidence NAS]; Interacting selectively with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules) [goid 5515] [evidence IEA]; Interacting selectively with ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator [goid 5524] [evidence IEA]; Catalysis of the transfer of a phosphate group, usually from ATP, to a substrate molecule [goid 16301] [evidence IEA]; Catalysis of the transfer of a group, e.g. a methyl group, glycosyl group, acyl group, phosphorus-containing, or other groups, from one compound (generally regarded as the donor) to another compound (generally regarded as the acceptor). Transferase is the systematic name for any enzyme of EC class 2 [goid 16740] [evidence IEA]; Modulates the activity of nitric oxide synthase [goid 30235] [pmid 12828935] [evidence IDA]; Interacting selectively with an identical protein or proteins [goid 42802] [pmid 16777603] [evidence IPI]; Interacting selectively with a nonidentical protein to form a heterodimer [goid 46982] [pmid 10572067] [evidence IDA]; Interacting selectively with an actin filament, also known as F-actin, a helical filamentous polymer of globular G-actin subunits [goid 51015] [pmid 14702346] [evidence IDA]