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Although proteins are generally composed entirely of l-amino acids, we have previously shown that Asp-151 in αA-crystallin from aged human lens is converted to the biologically uncommon d-isomer to a high degree. The formation of d-isomer was not simple racemization, but stereoinvertion. The reaction was also accompanied with isomerization to form β-Asp (isoaspartate) residue simultaneously; therefore,...
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