7429
Fas has been shown to require ICE ( interleukin - 1 beta - converting enzyme ) family proteases to induce apoptosis from studies utilizing the cowpox ICE inhibitor protein CrmA , the synthetic tetrapeptide ICE inhibitor YVAD - CMK , and the tripeptide pan - ICE inhibitor Z - VAD - FMK .
 Fas, ICE, interleukin - 1 beta - converting enzyme, ICE inhibitor protein, CrmA, ICE, YVAD - CMK, ICE, Z - VAD - FMK
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Fas, ICE, interleukin - 1 beta - converting enzyme, ICE inhibitor protein, CrmA, ICE, YVAD - CMK, ICE, Z - VAD - FMK