since there seems to be a succession of events following differentiation of type a1 spermatogonia till the last type b cell differentiates into resting primary spermatocytes , may intermediate stages between the presently described classes of type a ( a0-a2 ) and type b ( b1-b3 ) could also be located in sections of the seminiferous tubules .
C0037866
spermatogonia
C0036630
seminiferous tubules