Representative photomicrographs of the toluidine blue-stained sections 5-mm distal to nerve allografts harvested at 40 and 70 days at ×400 magnification. By 40 days postoperatively, treatment with (A) Tacrolimus increased nerve regeneration compared with (B) Cyclosporine-A and (C) untreated allografts, while at 70 days, differences between (D) tacrolimus, (E) Cyclosporine-A, and (F) untreated groups could not be distinguished from one another. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]