O SPr MGI:98475 http://identifiers.org/mgd/MGI:98475 substance p receptor NK-1R Tac1r genetic mapping Tacr1 tachykinin receptor 1 protein coding gene NK1-R Gene + NK1 receptor neurokinin receptor 1 Tac1r|SPr|NK1-R|NK-1R|neurokinin receptor 1|NK1 receptor|substance p receptor