When Cdk7nos-D137R.bcd3'UTR is expressed in early embryos, no modification or delay is seen in the timing of the first 13 nuclear divisions, however at the end of the maternal division program, a corresponding zone with twice the normal density of interphase 14 nuclei are observed, resulting from the appearance of an extra synchronous division in the domain of expression of the Cdk7D137R.Scer\UAS.T:Ivir\HA1 proteins.