This document analyzes blood typing results from 4 patients: Ms. Brown, Mr. Jones, Mr. Green, and Mrs. Smith. The analysis of Ms. Brown's blood sample showed no agglutination with any of the anti-sera, indicating she has type O negative blood. Patients with this blood type can safely receive blood from any type, but can only donate to other type O patients. The document also discusses the differences between agglutinogens and agglutinins, how blood typing is used in transfusions and organ transplants, and the potential for developing a vaccine to prevent erythroblastosis fetalis in Rh-negative mothers.