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.

Stromelysin - 1 ( ST1 ) was observed in about 10 % of epithelial cells in the control groups ( cases of fibrocystic and benign proliferative breast disease ) , while expression ( > 10 % of expression ) was detected in 89 . 7 % of tumours .
Output:
Stromelysin - 1