Isoform:Aproteinthat has the same function as another protein but which is encoded by a differentgeneand may have small differencesinits sequence. For example, transforming factor beta (TGF-B) exists in three versions, or isoforms (TGF-B1, TGF-B2, and TGF-B3), each of which can set off a signalingcascadethat starts in thecytoplasmand terminates in thenucleusof thecell.
