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We have previously shown that Asp-151 in αA-crystallin from aged human lens are converted to the biologically uncommon D-isomer to a high degree, showing that the formation of D-isomer was not simple racemization, but stereoinvertion. This suggests that αA-crystallin has a chiral reaction field which promotes the inversion of L-Asp to D-Asp residues in the native higher order structure of αA-crystallin...
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