So after interface, we have the precursor excel, basically replicates each one of these two chromosomes. So remember, we have a normal individual. So we have one of these and one of these. Now we replicated and so we produce the cystochromatid that is identical to this chromatid and we produce this second cystochromatid that is identical to this one. And so we have the pair of cystochromatids as shown in the following diagram. So this is after interface takes place.