Detailed Instructions: In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.
Problem: Foamy viruses ( FVs ) express the Gag protein as a precursor with a molecular mass of 74 kDa ( pr74 ) from which a 70 - kDa protein ( p70 ) is cleaved by the viral protease .
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Gag protein