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“Ghrelin contains an octanoic acid at the third residue serine, and the presence of octanoic acid on ghrelin is critical to its physiological functions.”
The Journal of clinical endocrinology and metabolism • 2001 | View Paper
“Moreover, synthetic ghrelin derivatives demonstrated that octanoic acid is not the only modification of the Ser(3) side chain to sustain the activity of ghrelin ; other acyl acid modifications maintained activity.”