# pathway valine step natD # Singleton 1 TCDB::Q8YXD0 3.A.1.4.6 heteromeric Singleton1 NatD, component of The neutral amino acid permease, N-1 (transports pro, phe, leu, gly, ala, ser, gln and his, but gln and his are not transported via NatB) curated:TCDB::Q8YXD0