17186
RPGR and RP2 genes expressed in the photoreceptor sensory cilia are predominantly implicated in XLRP ; however , the interpretation of genetic mutations and their correlation with clinical phenotypes remain unknown , and the role of these genes in photoreceptor cilia function is not completely elucidated .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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