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NBME 20 Answers

nbme20/Block 1/Question#29

During an experiment, an investigator isolates an ...


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submitted by strugglebus(69),

Lysine is used in elastin and collagen cross linking; it is cross linked by lysyl oxidase to make collagen fibers

charcot_bouchard  Thats my brother from UFAP mother +1  

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submitted by notadoctor(58),

Analysis of the elastin in the question showed a decreased number of desmosine cross-links. Desmosine is made up of four lysine residues. Therefore abnormal elastin is likely missing lysine necessary for the formation of these desmosine cross-links. Wikipedia article on Desmosine.

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