Ribonuclease QBI-139

**Semantic type:** Amino Acid, Peptide, or Protein|Enzyme|Pharmacologic Substance

**Definition:** A nuclease of mammalian origin that cleaves the phosphodiester bond between nucleotides of ribonucleic acids with potential antineoplastic activity. Ribonuclease QBI-139 catalyzes the hydrolysis and degradation of RNA leading to the inhibition of protein synthesis and cell death.

**Synonyms:** - QBI-139 - RNase QBI-139