GGTLC1 and cholestasis: Patients receiving anti-Staphylococcus prophylaxis demonstrated higher levels of serum cholestasis markers such as gamma glutamyl transpeptidase (GGT), alanine aminotransferase (ALT) and aspartate aminotransferase (AST), but not alkaline phosphatase (ALP) (Fig. S21G-J and S23D-G).