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Non-fasting ghrelin levels in lean rats (open bars, n=5), and obese Zucker rats 14 days following sham surgery (closed bars, n=11) or sleeve gastrectomy (hatched bars, n=8). A: Total ghrelin levels calculated as acylated ghrelin levels + un-acylated ghrelin levels. B: Acylated (active) ghrelin levels. C: Active / total ghrelin ratio. Data are expressed as mean ± S.E.M. * represents P < 0.05 relative to the obese sham group.
