Abstract
Antigenic analysis of adult female-specific blood and yolk proteins in Oncopeltus demonstrated an incomplete vitellogenin (A), which appears in the blood prior to yolk deposition and is later modified or joined by an antigenically complete molecule (AB). Vitellogenin AB is antigenically indistinguishable from the major yolk protein of mature eggs, though the electrophoretic mobilities of the two differ in 6% acrylamide gels. Vitellogenin A alone appears in the blood of adult females in which the corpora allata are known to be inactive, i.e., during starvation or photoperiodically induced diapause. Stimulation of these females with a juvenile hormone analog restores yolk deposition, and also induces the appearance of AB in the blood. While juvenile hormone is needed for the termination of diapause and the maturation of vitellogenin in this species, diapause begins with the vitellogenin-producing mechanism already partially assembled.
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