Using the Neo^R/Tk System of Introducing Gene Replacements into Mice

Multiple Choice

Using the Neo^R/Tk system of introducing gene replacements into mice (as described in the text) , which of the following would identify those mouse cells that were the result of homologous recombination?

A) Neo^R only
B) Tk only
C) Neo^R and Tk
D) Neither Neo^R or Tk