We detected single germline cells in the apical region of cyst cell-caEGFR-testes and cyst cell-sSpi/EGFR-testes (Figures 3B, 3C, arrowheads), followed by very few clusters of spermatogonia (Figures 3B, 3C, small arrows), and, more basally, clusters of spermatocytes (Figures 3B, 3C, large arrows, Table 2). Here, EGFR is linked to cyst.