ULTRASTRUCTURAL-STUDY OF THE DOGFISH MATURE EGG-CAPSULE GLAND ZONES SECRETING PROTEIC AND GLYCOPROTEIC MATERIAL

  • 1 January 1978
    • journal article
    • research article
    • Vol. 67  (2) , 107-119
Abstract
The ultrastructural study of the zones (D, E, F1) of a mature dogfish egg-shell gland secreting proteic and glycoproteic material indicates a wide range of secretions. Besides the 2 types of grain found in each of the 2 zones D and E (respectively, spiralled and heterogeneous) a 2nd type of heterogeneous grain as well as a 4th one composed of tiny dense particles are present in zone E. A 5th type of grain is revealed in zone F1. The Golgi apparatus is undoubtedly involved in the formation of F1 grains and of both heterogeneous grains but seems to be irrelevant to zone E secretion of dense grains. As regards spiralled grains there is no evidence of the 1st stage of their formation in the mature gland. The grains specifically involved in the formation of the collagenic protein were not positively identified.