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Its important to remember that while dark spots are usually harmless, any changes in your skin should be evaluated by a healthcare provider to rule out serious conditions like skin cancer

doi: 10.1073/pnas.1507228112 157 NicklinPBergmanPZhangBTriantafellowEWangHNyfelerBet al

They interfere with signal transduction in melanocytes, leading to the death of these cells and acting as a mediator of the damaging effects of oxidative stress [22]

A42 with its Tyr-10 substituted by phenylalanine would keep the aromatic nature of the side chain at residue 10 of A but lack the OH group of Tyr that was purported by others to be the source of the free radical of A42

Tenchov R, Sasso JM, Zhou QA

the samples were vortexed vigorously for 30 seconds and held on ice