Which of the following statements concerning tumor suppressor genes (TSG) is FALSE?
a) The TSG p53 marks the proteasome for degradation.
b) One of the most commonly altered TSG is p53.
c) The products of TSG generally decelerate cell growth.
d) Loss of heterozygosity is a mechanism for the inactivation of a TSG.
e) One or more TSG are typically mutated or absent in human cancers.