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The presence of four conserved Cys residues in the C - terminal regions of very diverse gpL homologues suggest that utilization of an iron - sulfur cluster is a widespread feature of non - contractile tailed phages that infect Gram - negative bacteria .
 Chemical: Cys; Chemical: C; Chemical: iron - sulfur
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Cys; Chemical: C; Chemical: iron - sulfur