# pathway lactose step lacIIB # Singleton 1 TCDB::U5MIE1 4.A.3.2.9 Klebsiella pneumoniae CG43 heteromeric Singleton1 PTS lactose transporter subunit IIB, component of PTS-type lactose transporter, IIC-IIB-IIA curated:TCDB::U5MIE1