Effect of vitamin B12 status on the occurrence of branched-chain and odd-numbered fatty acids in the liver lipids of the baboon.

Branched chain fatty acids of the anteiso series and others with methyl substitution nearer to the carboxyl group were found, together with odd numbered, straight chain fatty acids, in very small proportions in baboon liver lipids. The proportions were increased in vitamin B12-depleted animals, especially after administration of a B12 analogue.