Escherichia coli	-	210326, 210327, 210328, 210329, 210330, 667642, 685614, 685616, 713095, 713485, 713505, 719509, 719930, 734003, 734281, 734760, 734771	
Escherichia coli	BtuD; gene btuD	697950	
Escherichia coli	encoded by btuD gene	690056	
Escherichia coli	encoded by btuD gene; K12	685626	
Escherichia coli	genes btuC, btuD, and btuF encoding for vitamin B12 import system permease protein BtuC, vitamin B12 import ATP-binding protein BtuD, and vitamin B12-binding protein BtuF	750063, 751644, 751661, 751956, 752215, 752221	
Escherichia coli	permease protein BtuC	719987	
Escherichia coli	strain K12	685066, 685135	
Escherichia coli	subunit BtuD	720849	
Haemophilus influenzae	-	696776	
Homo sapiens	-	749821, 752200