N6-Acetyl-L-lysine/Creatinine &#x7C; Urine &#x7C; Chemistry - non-challenge
n6-acetyl-l-lysine/creatinine &#x7c; urine &#x7c; chemistry - non-challenge
N6-Acetyl-L-lysine/Creatinine &#x7C; Urine &#x7C; Chemistry - non-challenge
n6-acetyl-l-lysine/creatinine &#x7c; urine &#x7c; chemistry - non-challenge