We have already seen that, even in humans, there is more to this substance than meets the eye. It contains proteins that, when mixed together, can forge a mating plug. But this list of ingredients is just the tip of the iceberg. Even in the ejaculate of the lowly banana fly Drosophila melanogaster, researchers have identified no fewer than different kinds of proteins.
The series was written by Cumming and co-star Forbes Masson , continuing an acting-writing partnership the two had developed since their drama school days. Also in , Cumming appeared in the series Ghosts. He has also made several documentaries: Cumming has guested on several US TV shows: