Isotopic enrichment values of the equilibration time course for (A) oxygen-18 (18O) and (B) deuterium (2H) of three green turtles (Chelonia mydas). Isotopic enrichment values of the equilibration time course for (A) oxygen-18 (18O) and (B) deuterium (2H) of three green turtles (Chelonia mydas). These enrichments represent the background enrichment levels (day 0) and the enrichment levels post intra-coelomic injection and during the plateau period. T. Todd Jones et al. J Exp Biol 2009;212:2635-2644 ©2009 by The Company of Biologists Ltd