501
In vitro experiments showed that PKI55 inhibits recombinant PKC isoforms alpha , beta 1 , beta 2 , gamma , delta , zeta , ; to identify the minimal amino acid sequence of PKI55 protein maintaining the inhibitory effects on PKC , peptides derived from both C - and N - terminal sequences have been synthesized .
 Chemical: amino acid; Chemical: C; Chemical: N
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: amino acid; Chemical: C; Chemical: N