Routine Neonatal Testing Suggests That a Baby Lacks a Transport

question 1

Multiple Choice

Routine neonatal testing suggests that a baby lacks a transport protein responsible for the uptake of cysteine in the intestines and kidneys.However,although cysteine accumulates in the urine,its concentration in the plasma is normal when the child receives a diet containing protein.Which intestinal transporter probably provides for uptake of cysteine in this child?

• A)CFTR
• B)Na⁺/K⁺/2Cl^- cotransporter,isoform 1 (NKCC1)
• C)Epithelial sodium channel (ENaC)
• D)Peptide transporter 1 (PepT1)
• E)SLC6A19 gene

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