CSF extract was supplemented with Myc-XErp1 DSG- DSA- ZBR- (S33N S38N S284N S288N C583A) IVT and as indicated treated with DMSO or CsA. Both reactions were treated with calcium and samples were taken at the indicated time points. Samples were immunoblotted for the Myc-tag, cyclin B2 and α-tubulin. A pseudocoloured representation of the Myc immunoblot is shown in Fig EV2A. Arrow marks the meiotic phosphorylation state of Myc-XErp1. Asterisk indicates unspecific bands. 