Abstract
Yolk-platelet formation in the South African clawed toad, Xenopus laevis, was studied with the electron microscope. A dual mode of formation was found. One being associated with mitochondria, the other with the Golgi complex. These two ways of yolk formation are named yolk formation I and yolk formation II respectively. Yolk formation I involves an extensive uptake of pinocytotic vesicles, whilst yolk formation II takes place within large Golgi vesicles surrounded by a coat of lipid droplets entirely without participation of pinocytotic activities. Thus it is concluded that yolk platelet I formation represents an extraoocytic synthesis as opposed to the intraoocytic synthesis of yolk platelet II formation.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
