Homozygous RB1 Gene Deletion

**Semantic type:** Cell or Molecular Dysfunction

**Definition:** A molecular abnormality referring to the loss of both copies of the RB1 gene.

**Synonyms:** - Biallelic RB1 Deletion - Biallelic RB1 Gene Deletion - Homozygous RB Gene Deletion - Homozygous RB1 Deletion - Homozygous Retinoblastoma 1 Gene Deletion - Homozygous Retinoblastoma Gene Deletion - Two-copy RB1 Deletion