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The nucleotide sequence of the estrogen receptor gene of Oreochromis aureus ( OaER ) indicates that the hormone - binding E domain is composed of 4 exons interspersed by short introns of only 0 . 18 - 1 . 3 kb each .
 GENE: estrogen receptor gene of Oreochromis aureus; GENE: OaER
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: estrogen receptor gene of Oreochromis aureus; GENE: OaER