Fig. 2. SCP3 is highly enriched at homologous centromeres (arrowheads), but is still present at the interchromatid domain (arrows) in metaphase I bivalents. SCP3 is labelled in green and DNA in blue. (A,C) Partial projections from different focal planes throughout the same metaphase I spermatocyte. The SCP3 labelling in the sex bivalent (XY) is observed in C. A pachytene (P) SC fragment (SC) is apparent in the upper right corner in C. Scale bar: 10 µm.