You will be given a definition of a task first, then some input of the task.
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.

The library will thus be useful for the selection of cosmid clones which carry CDC genes from yeast by complementing first , with the vectorial yeast gene URA1 , the pyrimidine auxotrophy of most cdc - strains and then , with the respective CDC wild - type genes , of the temperature - sensitive mutant alleles .
Output:
yeast gene URA1