TABLE 1.

Characteristics of the ¹³C-labeled 2-, 4-, and 6-methylated fatty acids recovered from cultures of strain AK-01 grown on [1,2-¹³C₂]hexadecane

Cellular fatty acida	Chemical structure and location of 13C label for the fatty acid isotopmerb:		Relative abundance of isotopmers A and Bc
	A	B
2-Me-16:0			94:100
4-Me-18:0			91:100
6-Me-20:0			100:81

^aOther recovered ¹³C-labeled fatty acids, namely 14:0, 10-Me-14:0, 16:0, and 10-Me-16:0, are not shown here. None of these fatty acids was found in the sterile control. 

^bDetermined by interpretation of the mass spectrum for each fatty acid. 

^cIsotopmer A/B ratios. Results are estimations based on the relative intensities of the doublet of diagnostic ion peaks for each fatty acid.