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protohemin

n.
1.a reddish-brown chloride of heme

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    Idiom of the Day

    license to (do something)
    the permission or right or chance to do something
    When my uncle got the contract to sell food at the stadium it was a license to print money.



    1.
    Choose an idiom to replace the expression in the brackets:
    I was very angry at first but now I have begun to (quiet down).

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    The song Happy Birthday to You was originally written by sisters Mildred and Patty Hill as Good Morning to You. The words were changed and it was published in 1935.      .. More >>
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