studies on the expression of six c-onc genes in human cells revealed at least three categories of onc genes : ( a ) those that are universally expressed and probably are important in basic cellular functions , ( b ) those that are not detectably expressed in the cells examined and may have very transient expression in development , and ( c ) those that are only expressed in specific cell types and may be important in tissue differentiation .
C0007613
cellular functions
C0007634
cells