Figure 3: Transmission Electron Micrograph (TEM) of non-treated (control) hermaphrodite gland of L. marginatus slug showing most of stages of gametogenesis as well as Sertoli cell. (Po=primary oocyte, So=Secondary oocyte, Ps=Primary spermatocyte, ss=Secondary spermatocyte, N=nucleus, Nm=nuclear envelope, Sc=Sertoli cell, v=vacuole (X=4000).