title: Sex steroid hormones and steroid secretory cells in the gonads of cyclostomes and fish
abstract: . The purpose of this work is to generalize data on the content of sex steroid hormones in cyclostomes and fish in connection with the different state of the gonads, as well as on the localization and ultrastructural organization of steroid secretory cells (SCs). Method used : generalization of literature data. Novelty : for the first time, data on the development of SC in the gonads of juvenile fish are presented on the scale of a literature review; changes in their localization and functional 
journal: Trudy VNIRO