• Vacuum freeze-drying preservation: Prepared as freeze-dried powder, stored in 2-8°C refrigerator, able to be preserved for more than 2 years.
• Glycerol freezing tube preservation: preserved in -80°C ultra-low temperature refrigerator, able to be preserved for more than half a year.
• Activator preservation: preserved in 2-8°C refrigerator, able to be preserved for 1-2 weeks.