Macrobodies in chick blastoderm.

The results of this study show that the epiblast cells of chick blastoderm at Hamburger-Hamilton stage 1 contain macrobodies which themselves contain particles resembling the 'lining bodies' described by Bellairs. Since different structures ranging from macrobodies to light vacuoles have been found, it seems probable that their contents are utilized at this stage. Typically, they are surrounded by mitochondria, some of which have an abnormal internal structure. At later developmental stages neither macrobodies nor abnormal mitochondria were observed.