• Immunobiology of transplantation emerged as a central theme, integrating passive transfer experiments, isoantibody effects, delayed-type hypersensitivity, and irradiation-modulated immunity to map host–graft rejection pathways. [6] [10] [13] [11]

• Genetic identity and relatedness dictated early graft outcomes, with kidney transplants between identical twins, siblings, and twin pairs illustrating compatibility-driven survival and the viability of homografts. [2] [1] [7] [17] [18] [5]

• Clinical evolution toward durable graft function combined surgical case-series with immunosuppressive strategies and problem-solving in six-member renal homograft experiences. [16] [15] [14] [3]

• Hematopoietic/immune system manipulation emerged as a strategy to support transplantation, via bone marrow infusion and lymphoid cell transfers in irradiated and non-irradiated contexts. [4] [12] [9] [11]

• Skin grafts and isoantibody studies served model systems for dissecting transplantation immunity and tolerance, providing mechanistic insights applicable to broader organ transplantation. [10] [13] [9] [19]