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A gene in Drosophila melanogaster that maps cytologically to 2C1 - 3 on the distal portion of the X - chromosome encodes a member of the steroid / thyroid hormone receptor superfamily .
 GENE: steroid / thyroid hormone receptor superfamily
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: steroid / thyroid hormone receptor superfamily