Picornain 2A (EC 3.4.22.29, picornavirus endopeptidase 2A, poliovirus protease 2A, rhinovirus protease 2A, 2A protease, 2A proteinase, protease 2A, proteinase 2Apro, picornaviral 2A proteinase, Y-G proteinase 2A, poliovirus proteinase 2A, poliovirus protease 2Apro) is an protease enzyme.