(A) Fragments of pentadecanoatic acid (C15:0) measured by GC-MS. An asterisk (*) indicates the expected location of ¹³C-labeled carbon atoms from [U-¹³C]valine. (B) Mass isotopomer distributions for four fragments of C15:0 retaining different parts of the fatty acid carbon backbone (from [U-¹³C]valine experiment). (C) Mass isotopomer distributions measured for four fragments of C16:0 from [U-¹³C]valine experiment.

<p>(A) Fragments of pentadecanoatic acid (C15:0) measured by GC-MS. An asterisk (*) indicates the expected location of ¹³C-labeled carbon atoms from [U-¹³C]valine. (B) Mass isotopomer distributions for four fragments of C15:0 retaining different parts of the fatty acid carbon backbone (from [U-¹³C]valine experiment). (C) Mass isotopomer distributions measured for four fragments of C16:0 from [U-¹³C]valine experiment.