Alpha-1,3-xylosyltransferase, which elongates the O-linked xylose-glucose disaccharide attached to EGF-like repeats in the extracellular domain of target proteins by catalyzing the addition of the second xylose . Known targets include Notch proteins and coagulation factors, such as F9 .
Endoplasmic reticulum membrane ; Single-pass type II membrane protein .
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