after incubation of the organism in broth containing co ( 57 ) - or p ( 32 ) - vitamin b ( 12 ) , electrophoresis of the extracted corrinoids yielded two major , yellow , radioactive fractions , designated a and b , with spectral and electrophoretic properties similar to pigments i and ii , derived from vitamin b ( 12 ) by aerobacter aerogenes .
C1256766
corrinoids
C0042845
vitamin b ( 12