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RESEARCH QUESTION Which cryopreservation method better protects reproductive potential the cryopreservation of a testicular cell suspension (TCS) or the cryopreservation of testicular tissue (TET)? DESIGN Two cryopreservation strategies for spermatogonial stem cells (SSCs) were compared in a mouse model cryopreservation as TET or as TCS. Evaluated outcomes were number of viable cells after thawing, number and length of donor-derived colonies after spermatogonial stem cell transplantation (SSCT), number of litters, litter size and numbe