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.

Input: Consider Input: Mutation of Gly721 alters DNA topoisomerase I active site architecture and sensitivity to camptothecin.

Output: DNA topoisomerase I


Input: Consider Input: Multilevel regulation of 2-cys peroxiredoxin reaction cycle by s-nitrosylation.

Output: 2-cys peroxiredoxin


Input: Consider Input: Combination chemotherapy with a substance P receptor antagonist (aprepitant) and melarsoprol in a mouse model of human African trypanosomiasis.


Output: substance P receptor