title: Ultrastructural and functional effects of freezing rat hearts to -10 degrees C and -20 degrees C without a cryoprotectant.
mesh_terms: D000818:Animals; D002467:Cell Nucleus; D005615:Freezing; D016027:Heart Transplantation; D008928:Mitochondria; D009206:Myocardium / Q000473:pathology; D051381:Rats; D012519:Sarcoplasmic Reticulum; D014021:Tissue Preservation