The enzyme adenosine deaminase (ADA) is mainly produced by the

The enzyme adenosine deaminase (ADA) is produced by many body cells, particularly lymphocytes. Adenosine deaminase enzyme converts a toxic molecule called deoxyadenosine, generated when DNA is broken down, into a nontoxic deoxyinosine. ADA deficiency affects the proliferation of lymphocytes leading to severe combined immunodeficiency (SCID).