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Belatacept (trade name Nulojix, Bristol-Myers-Squibb), a fusion protein of a Fc fragment (human IgG1 isotype) and the extracellular domain of CTLA-4, can be used to extend graft survival while limiting the toxicity generated by standard immune suppressing regimens, such as calcineurin inhibitors. Belatacept differs from abatacept (trade name Orencia) by only 2 amino acids. The CTLA-4 protein is important for T-cell costimulation and selectively blocks the process of T-cell activation.