Sheep
Cysteine is required by sheep in order to produce wool: It is an essential amino acid that must be taken in as food from grass. As a consequence, during drought conditions, sheep stop producing wool; however, transgenic sheep that can make their own cysteine have been developed.
Read more about this topic: Cysteine
Famous quotes containing the word sheep:
“We are sheep in a herd of sheep,
but Clytemnestra, Electra and Death
are burnt like star-names in the sky.”
—Hilda Doolittle (1886–1961)
“A sheep who goes looking for a wolf is sure to find one.”
—Mason Cooley (b. 1927)
“The mountain sheep are sweeter,
But the valley sheep are fatter;
We therefore deemed it meeter
To carry off the latter.”
—Thomas Love Peacock (1785–1866)