Stage-specific immunolocalisation of ADAM17 in adult rat testes. (A) High and low (A’) power magnification of Pale (stage IX-XII), Weak (stage XIII-I) (B, B’), Strong (stage II-V) (C, C’) and Dark (VI-VIII) (D, D’) segments. The residual cytoplasm of elongating spermatids (A, B, arrowheads) and the tail of elongated spermatids (C, D arrowheads) shows an immunoreaction against the antibody against ADAM17. The negative control, without primary antibody, of the different segments are shown in A”, B”, C” and D”. Bars = 50 μm.