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:  Combinations of penicillin with kanamycin , tobramycin , sisomicin , and netilmicin have consistently failed to demonstrate synergistic killing of S . faecium in vitro [ 6 ] .
Output:
S . faecium