Coformycin: A ribonucleoside antibiotic synergist and adenosine deaminase inhibitor isolated from Nocardia interforma and Streptomyces kaniharaensis. It is proposed as an antineoplastic synergist and immunosuppressant.Adenosine Deaminase Inhibitors: Drugs that inhibit ADENOSINE DEAMINASE activity.AMP Deaminase: An enzyme that catalyzes the deamination of AMP to IMP. EC 220.127.116.11.Ribonucleosides: Nucleosides in which the purine or pyrimidine base is combined with ribose. (Dorland, 28th ed)Nucleotide Deaminases: Catalyze the hydrolysis of nucleotides with the elimination of ammonia.Nucleoside Deaminases: Catalyze the hydrolysis of nucleosides with the elimination of ammonia.Adenosine Deaminase: An enzyme that catalyzes the hydrolysis of ADENOSINE to INOSINE with the elimination of AMMONIA.Adenosine Monophosphate: Adenine nucleotide containing one phosphate group esterified to the sugar moiety in the 2'-, 3'-, or 5'-position.Adenosine: A nucleoside that is composed of ADENINE and D-RIBOSE. Adenosine or adenosine derivatives play many important biological roles in addition to being components of DNA and RNA. Adenosine itself is a neurotransmitter.