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+last lecture on bistability! going to get examples.
+assume should do assignment #3 after this.
+should read: Ferrell (2002) Curr. Op. Cell Biol. 14:140-148
+"lac operon" example is with lactose metabolism in E. Coli bacteria, where
+presence of lactose can lead to gene expression for allowing even more lactose
+into the cell. when this process starts, it is self-reinforcing and triggers on