Twin A Twin B Controls (range) VLCFAs       C22 (µg/mg protein) 0.610 0.691 0.50-1.30 C26:0 (µg/mg protein) 0.353 0.402 0.03-0.11 C26:1 (µg/mg protein) 0.450 0.488 0.02-0.16 C26/C22 0.579 0.581 0.05-0.11 Plasmalogen Synthesis       14C/3H 0.234 0.204 0.99-2.31 3H/14C 4.415 4.939 0.48-0.86 Serum levels of very long chain fatty acids.

Table 2: Very long chain fatty acid (VLCFA) concentrations and levels of plasmalogen synthesis in cultured fibroblasts.