Fig. 1. Light and ultrastructural phenotypes of spe-37(gf)/+ mutant sperm. (A-D) Various stages of wild-type spermatogenesis at identical magnifications. (A) Primary spermatocyte; (B) dividing primary spermatocyte; (C) dividing secondary spermatocytes; (D) spermatids. (E-H) Terminal phenotype of various spe-37(gf)/+ mutant spermatocytes. The independently derived eb1947, q89 (not shown) and e104 mutants bear the identical spe-37 mutation. (I,J) Transmission EM of spe-37(e1947)/+ spermatocytes: (I) early mutant phenotype; (J) terminal mutant phenotype. n, nucleus; fb-mo, fibrous body-membranous organelle; mo, membranous organelle; ne, nuclear envelope. Scale bars: 5 µm in A-H; 1 µm in I,J.