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In page Major royal jelly protein:

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In 1994, Hanes and Šimuth's team identified genes called pRJP57–1 and pRJP57–2 from the bee head and found that these genes produce similar protein to the first MRJP.[5] By 1999, several independent scientists confirmed the existence of five MRJPs.[1] The Honeybee Genome Sequencing Consortium reported in 2006 that there are nine genes for nine MRJPs.[6]