Abbildung 1a-d: 1. (A): Pachytene chromosome axes (SCs) of a wild-type mouse revealed by SYCP3 immunostaining (B): Atm–/–
zygotene-like spermatocyte which displays pairing errors (arrow). In this condition SC formation is never complete.
For details see . (C): Wild-type spermatocyte stained for the cohesin subunit STAG3 (green, SCs) and fluorescence
in situ hybridization of telomeres (red). Wild-type chromosome axes (SCs) are long and capped by a distinct
telomere signal. (D): In the Smc1β–/– spermatocyte, chromosome axes and SCs are hyper-condensed and significantly
shorter than in the wild type. For details see . Magnification 630× in the original.