The gene src normally is activated by extracellular signals called growth factors. when the growth factors are present, src instructs the cell to divide. a mutant form of src is found in many cancer tumors. the mutant form of src is active in the absence of growth factors. the mutated src is a
a. tumor suppressor gene
b. oncogene
c. cancer gene
d. proto-oncogene
Answers: 1
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