Chromosome spreads were prepared from adult Syce3testes as described49 (link).
Chromosome spreads were stained with antibodies as described29 (link). Primary antibodies were mouse
anti-SYCP3 (Abcam #ab97672, 1:500), rabbit anti-SYCP1 (Abcam #ab15090, 1:200)
and rabbit anti-RAD51 (Millipore #PC 130, 1:500). Slides were mounted using
antifade mounting medium (Vectashield, H-1000) and high precision coverslips
(Marienfeld).