Figure 1.

The cartoon depicts (A) major components of the human male reproductive system and (B) major steps in spermatogenesis. Organs/tissues/cells, which were shown to express CaSR are depicted in color. Red color, CaSR expression shown in human ± other mammalian species; blue color, CaSR expression shown in mammalian species other than human (for details on species and assumed function of CaSR see Text and Table 1).