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An amelogenin gene , AMGX , has been mapped to the short of the X chromosome ( Xp22 . 1 - p22 . 3 ) and has been implicated in the molecular pathology of X - linked amelogenesis imperfecta ( AIH1 ) .
 X - linked amelogenesis imperfecta, AIH1
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 X - linked amelogenesis imperfecta, AIH1