Nurses pack the embryo containers.[Photo by Ma Xiaohui/Provided to chinadaily.com.cn]

Nearly 40,000 frozen human embryos were moved from a lab to the Dalian Women and Children's Medical Center in Dalian, Northeast China's Liaoning province, on Wednesday.

The center, which freezes more than 2,000 embryos every year, is where Dalian's first test-tube baby was born.

The rate of pregnancy of frozen-thawed embryo transfer is 55 to 58 percent.

Currently, the center is offering services of freezing eggs and embryos for women suffering from malignant tumor in Dalian to maintain their reproductive capacity.