sequence of neuropeptide gamma neurokinin A neuropeptide K substance P TKN1_MOUSE C-terminal-flanking peptide IMR:0703765 IMR:0703768 IMR:0703771 NK-1 NK1 NKA NPK Neurokinin A Neuromedin L Neuropeptide K Neuropeptide gamma Nka Nkna PPT PPT-A Protachykinin-1 SP Substance K Substance P Tac1 Tac2 UniProt:P41539 molecule_role neurokinin 1 neurokinin A preprotachykinin A substance P tachykinin 1