"This suggests that the pineal organ of the lamprey is not a one-cell system, but a system in which two types of opsins are present in different photoreceptor cells," states Dr. Seiji Wada.

This sometimes occurs when two different influenza strains meet up inside the same cell and exchange genes, allowing a new variant to emerge. Co-infection can create a predicament for viruses when ...

To carry out their study, the scientists labelled different cell types in two species of salamander in order to ascertain what kinds of cell give rise to new muscle tissue in salamanders that had ...