Cysteine is rapidly oxidized to cystine at physiologic pH, and virtually all ... levels of cysteine in the blood and urine. Cysteine plasma levels in cystinuria range from 0.06 to 0.09 mg.

(B) Typical hexagonal cystine crystals from the urine of Slc3a1 KO and WT mice ... ∗∗p < 0.01, ∗p < 0.05. Cystinuria is the most common inheritable cause of kidney stone disease ...