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  1. Genetics of Colorectal Cancer (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK126744
    ... previously identified variants in the bone morphogenetic protein receptor type 1A ( BMPR1A ) gene in affected individuals from 2 of 18 families ... HHT will have a pathogenic variant in the activin receptor-like kinase 1 ( ALK1 ) gene or in the endoglin ( ENG ) gene, but SMAD4 ...