Phase two is defined as the period when cells are proliferating - Hayflick called it the time of "luxuriant growth".

These cells proliferate abnormally rapidly, even compared to other cancer cells.

In the gastrointestinal tract, epithelial cells proliferate and die rapidly.

If a mutation occurs in an oncogene, cells can proliferate at a greatly accelerated rate.

The cancer is caused not because cells proliferate out of control but because they fail to die on schedule.

The epithelial cells proliferate and crowding results in a pseudo-multilayer appearance.

This pentaploid cell then proliferates to form the bacteriome of the embryo (Brown 1965).

In the case of wound healing, myoepithelial cells reactively proliferate.

The level increases as hairy cells proliferate, and decreases when they are killed.

White cells proliferated out of the bone marrow and flooded the system, attacking healthy systems.