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Fig. 8. Development of progranules (types I and II) into pigment granules
of ommochromes (type III). Ommochromes are progressively deposited
onto a homogeneous matrix of type I progranules (white spider),
through an intermediate state of vesiculated progranules type II
(light yellow spider). The progranules then decrease slightly in size and form
the ommochrome pigment granules (type III) (bright yellow
spider).