Abstract: A new approach to immune system transplantation and other organ transplantation is described below. The invention describes the novel use of human tissues, or products derived from human tissues including but not limited to antigens, proteins, glycoproteins, and carbohydrates, taken from an individual patient, group or group of patients, to induce immunological tolerance to human antigens in other mammals. Mammals thus rendered tolerant to human antigens can subsequently serve as immune system donors, and as donors of other biological systems, to recipient humans. The invention also uniquely integrates experimentally documented observations from diverse fields of biological and medical research. The invention provides novel treatments for all cancers; for hereditary and acquired immunodeficiency disorders including AIDS; for failures of host immunological defenses including infectious diseases; for hereditary end acquired bone marrow failure syndromes; and for autoimmune diseases.