Fig.6 Freezing and cryosubstitution with PVP cryoprotective agent for rat heart tissue. There are no glycogen particles in the muscular tissue.

• 图6经冷冻防护剂处理后的心肌组织，结构不如未经冷冻防护剂处理的心肌组织清晰，而且糖原颗粒均已消失。