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Histological appearance of preserved porcine testis tissue before and after grafting into recipient mice. (a) Testis tissue before grating; (b) 16 weeks after grafting from cooling preserved tissue; (c) 22 weeks after grafting from automated slow-freezing; (d) 22 weeks after grafting from vitrification. The arrow indicates an elongated spermatid, whereas the arrowhead indicates a round spermatid. Scale bar = 50 μm.
