2585
Atomic absorption spectrophotometry applied to bacterially expressed E1A proteins revealed that the 289 - amino acid protein binds one zinc ion , whereas the 243 - amino acid protein binds no zinc .
 GENE: E1A proteins
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: E1A proteins 
Answer:
 GENE: E1A proteins