The authors have observed, using an electron microscope, that the number of thesecretory granules and the development of various organelles in the apical epithelial cellof the Hatschek’s pit showed a positive correlation with the gonadal development andmaturity. At the same time, only the epithelial cells respond to GnRH-A(gonadotropin-releasing hormone analogue). Both cytological and endocrinological experiments demon-strate that the cell may be the primitive gonadotropic cell of amphioxus.
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