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Lysine; Lys; K

Arginine; Arg; R

Histidine; His; H
r groups of basic amino acids do they accept protons
accept protons
physiological pH lysine and arginine
is it ionised
is it pos or neg charge
are fully ionised, thus positively charged
•Histidine physiological
how is it strong weak ?
because of this effect
weakly basic, thus its R group may positive or neutral depending upon surrounding environment