LGALS4 and cyst: Srlp knockdown in early germ cells using nos-Gal4 caused tiny testes and complete absence of germ cells (cells were Vasa and TUNEL (terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick-end labeling) negative), followed by accumulation of cyst cells (Fig. 1a and Fig. S2a).