Phenotypical and histological description of the testicular samples included in the study.^(a).

Abbreviations: conc., concentration; CS, conserved spermatogenesis; OA, obstructive azoospermia; SA, secretory azoospermia; SCO, Sertoli. cell only syndrome; Spcyte, spermatocyte; SpF, spermatogenic failure; Spgonia, spermatogonia; Sptid, spermatid; SSO, severe secretory. oligozoospermia; sgMF, maturation failure at spermatogonia level; scMF, maturation failure at spermatocyte level; rsMF, maturation failure at round. spermatid level. (a)The mean number of the different type of cells per tubule is given in each group.