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When it gets to the end of a strand, its not a perfect fit on the end (the mechanics of this is a little complicated) and needs a bit of scratch DNA at the end of the strand to successfully complete the DNA replication
Minimal discomfort, as the needle is small and quick
10.1016/0028-3908(96)84626-0 34 GawrylukJ
Montebugnoli 2011
PubMed Research indicates that neutral pH (7.4) formulations increase niacinamide skin permeation approximately twofold compared to acidic pH (5.0), with corresponding changes in stratum corneum electrical properties facilitating enhanced transdermal delivery
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