1076
Recently , it has been shown that expression of human HOX 2 genes is sequentially activated by RA beginning from Hox 2 . 9 at the 3 ' end of the HOX 2 cluster ( A . Simeone , D . Acampora , L . Arcioni , P . W . Andrews , E . Boncinelli , and F . Mavilio , Nature [ London ] 346 : 763 - 766 , 1990 ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
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