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.

A phase II clinical trial on MDS was conducted in a cooperative study with orally administrable ara - C analogue , PLAC , which is resistant to cytidine deaminase and had shown an anti - tumor activity on various experimental tumors by oral route .
Output:
cytidine deaminase