Can you provide a page number please? I see it was previously changed to this to get Amboss to catch it, but if amboss is wrong and it’s simply an error on their end, I’d move to approve this.
Amboss has this as UDP-glucuronosyltransferase as well (just checked), although absent refers to Crigler-Najjar syndrome type 1, which we may need to specify. Type 2 refers to reduced levels of UDP-glucuronosyltransferase.