Natural products frequently possess highly selective and
specific biological activities. A striking illustration is the
influence of natural products on many of the molecular
processes operative in cell cycle progression. Details may
be found at the Web site of the Roscoff Biological Station
(http://www.sb-roscoff.fr/CyCell/Frames80.htm), which covers
diagrams originally published by Meijer189 on natural
products and the cell cycle, with a modified version shown
below in Chart 2