Evidence for the Presence of Molt-Inhibiting Hormone in the Sinus Gland of the Lobster Homarus americanus

Abstract
Implantation of American lobster (Homarus americanus) sinus glands into the ventral hemocoele of the crayfish (Procambarus simulons), in which molting has been induced by eyestalk removal, significantly retarded the onset of molt (P < 0.001). Implanted animals required nearly twice as much time to molt as controls; implanted animals molted in approximately 15 days and controls in about 8. These findings support the hypothesis that the lobster sinus gland contains a molt-inhibiting hormone.

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