Figure 2: The distribution of FSH-R in the ductuli efferentes (a) and the epididymis (b–d) of man. (a) The cytoplasm of nonciliated (red arrow) and the apical cytoplasm of ciliated cells (green arrow) of the ductuli efferentes was positive for FSH-R. (b) The immunoreaction for FSH-R was more intensive in the apical cytoplasm of all principal cells of the caput epididymis (black arrows). (c-d) The decreasing intensity in the cytoplasm of groups of principal cells of the corpus (c) and the cauda epididymis (d) Scale bar: 20  𝜇 m.