Cryopreservation, a division of Cryobiology, is a process which stores cells, tissues, gametes, and embryos in low temperatures for future use. The use of this technique began less than 100 years ago when red bloods cells were frozen for blood supply during World War II. (16) Since then it has expanded and tested the limits of science. Cryopreservation has extended to tissues and embryos, and there is research exploring the idea of freezing organs, though it is not successful as of now (17). Cryopreservation has many practical uses such as preserving sperm for future use, especially in cancer patients, and preserving a person’s blood for use in surgery or transfusions to prevent diseases from another’s blood. The use of these techniques has been largely controversial over the last few years. |
 Embryonic cryopreservation, Figure 1 |
