Sequential events
of the cell cycle, represented by the circle of flat blocks, which is directed
by a distinct cell cycle control system, as it is represented with a knob in
the center. The Cell Cycle Control System is a cyclically operating set of
molecules in the cell that both triggers and coordinates key events, in the
cell that both triggers and coordinates key events in the cell cycle. Stop and
go-ahead signals can regulate the cycle in a critical control point known as
the checkpoint. During the G1 and G2 sub phases of interphase and in the M
phase, red barriers represent the 3 major checkpoints. For a lot of cells G1
checkpoint is the most important. Cells that responds to growth factors has
molecules of a certain receptor protein in its plasma membrane. “Signals” are
changes that a molecule induces in the next molecule in the pathway. Control of
the cell cycle is one of the hottest areas in Biology today as research says.
As it leads for a greater understanding of Cancer.
http://www.google.com/imgres?q=Growth+Factors+Signal+The+Cell+Cycle+Control+System&hl=en&client=firefox-a&hs=LjO&sa=X&rls=org.mozilla:en-US:official&biw=1440&bih=754&tbm=isch&prmd=imvns&tbnid=kfOwOTvDa7BwuM:&imgrefurl=http://en.wikipedia.org/wiki/Cell_cycle&docid=wYjnu8Cr_48YFM&imgurl=http://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/Cell_Cycle_2-2.svg/300px-Cell_Cycle_2-2.svg.png&w=300&h=306&ei=jPdZUPuzCJG88wS52IH4AQ&zoom=1&iact=hc&vpx=1177&vpy=403&dur=72&hovh=227&hovw=222&tx=123&ty=143&sig=105512698409091355603&page=2&tbnh=137&tbnw=132&start=29&ndsp=39&ved=1t:429,r:14,s:29,i:211
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