41. That test, the PSA, for prostate specific antigen , can lead to the detection of tiny tumors. 42. Mature lymphocytes recirculate between the blood and the peripheral lymphoid organs until they encounter their specific antigen . 43. Part of Abbott's growth came from the FDA approval of a widely-used prostate-specific antigen test for men. 44. Fair said the difference also was reflected in tested levels of prostate specific antigen in the rodents'blood. 45. Prostate-specific antigen ( PSA ) blood test. 46. When a prostate-specific antigen test was developed, Stowers made it available in Kansas City at no cost. 47. Protein C inhibitor has often been shown to interact with prostate specific antigen , protein C and PLAU. 48. PSA, or prostate-specific antigen , levels were cut in half or greater in 81 percent of the patients. 49. _Against routine, widespread screening for prostate cancer with prostate-specific antigen ( PSA ) or digital rectal examination. 50. Each T cell recognizes a specific antigen when it is presented in complex with a autoimmune diseases.