Cell Bio

There are two major checkpoints in the cell cycle. The first is at?

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1. http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/CellCycle.html

2. http://www.ncbi.nlm.nih.gov/books/bv.fcgi?db=Books&rid=mcb.section.3575

3. http://www.reactome.org/cgi-bin/eventbrowser?DB=gk_current&FOCUS_SPECIES=%20sapiens&ID=69620&

4. http://www.cellsalive.com/cell_cycle.htm (Interactive Animation!)

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