Figure 5. SDS-acrylamide gel electrophoresis of yolk proteins from Hyalophora cecropia. The two paravitellin bands are subunits of a protein that is synthesized by ovarian follicle cells. The remaining components are fat body products that were identical to standards isolated from the hemolymph. Lipophorin bands 1 and 2 are the 250 and 85 kDa apolipophorins I and II; vitellin bands 1 and 2 are the 180 and 45 kDa subunits of vitellogenin; the flavoprotein and arylphorin bands are, 85 and 75 kDa subunits of corresponding hemolymph storage hexamers; microvitellin is a 30 kDa monomer of microvitellogenin. (Adapted from Telfer and Pan, 1988).