Definition: 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:  Although the need for both a penicillin derivative and an aminoglycoside in the therapy of enterococcal endocarditis is widely known , it is important to distinguish between the differing efficacies of penicillin - aminoglycoside combinations for treating various species of enterococci such as S . faecium .
Output:
S . faecium