Which of the following statements is false?
a) Goats have been used to produce CFTR, a protein used in the treatment of cystic fibrosis.
b) Scientists have actually changes mice to rats by genetic engineering.
c) Goats have been engineered to produce spider silk proteins in their milk.
d) Genetic engineering has produced pigs with low phosphate feces.
e) Pigs with an added spinach gene produce more healthful fat.