Anti-lymphocyte globulin
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Anti-lymphocyte globulin (ALG) is an infusion of horse-derived antibodies against human T cells which is used in the treatment of acute rejection in organ transplantation, especially in kidney transplants.
It is less commonly used than the similar anti-thymocyte globulin (ATG), and like ATG it is associated with cytokine release syndrome in the short term and an increased risk of post-transplant lymphoproliferative disorder in the long term. ALG is more likely to cause side effects than ATG, but is safer than OKT3.