Study of choline chloride cryoprotective effect under leukocyte freezing down to – 40°C - O. O. Zajtseva; E. P. Svedentsov; O. N. Solomina; T. V. Tumanova; G. A. Nikulina; S. V. Utemov; A. A. Kostjaev; F. S. Sherstnev (Problems of cryobiology and cryomedicine, 2008)