The prophase 10 reconstruction is of a 42 micron wide by 28 micron high by 21
micron deep volume of the syncytial blastoderm of a Drosophila embryo fixed in prophase
of mitotic cycle 10 (at a time corresponding to two minutes following the early
interphase 10 situation the previous reconstructions show).  The density of microtubules
has increased dramatically. Most are no longer traceable back to the centrosomes which
presumably nucleated their polymerization. The F-actin caps present 2 minutes ago in
early interphase have become hollow rings, surrounding each  centrosome, which join
to make figure of 8 shapes. The chromatin has started to condense.