Routine neonatal testing suggests that a baby lacks a transport protein responsible for the uptake of cysteine in the intestine and kidneys
However, while cysteine accumulates in the urine, its concentration in the plasma is normal when the child receives a diet containing protein. Which intestinal transporter most likely provides for uptake of cysteine in this child?
A. CFTR
B. NKCC1
C. ENaC
D. PepT1
E. SLC6A19
ANS: D
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