The Ras oncogene, the first recognized human oncogene, was
identified using a tester cell line. The Rb gene was identified as
a tumor suppressor due to its presence in the rare hereditary
cancer retinoblastoma. a. Could the Rb gene also have been
identified using a tester cell line? Explain your answer? b. Name
two other methods which could have been used to identify Rb as a
cancer critical gene.