+ NK-1 NK1 MGI:98474 PPTA Tac1 O protein coding gene preprotachykinin A 4930528L02Rik Gene tachykinin 1 http://identifiers.org/mgd/MGI:98474 PPT-A|NK-1|neurokinin 1|substance P|Nkna|NK1|preprotachykinin A|PPTA|4930528L02Rik|neurokinin A|SP genetic mapping SP substance P Nkna neurokinin 1 neurokinin A PPT-A