spermatozoa that were cryopreserved in one of four zwitterion buffers ( tes-tris-citrate-egg yolk-glycerol ; tes-tris-citrate-i ) maintained higher progressive motility at 0 , 1 , 2 , and 4 hours post-thaw as compared to cells frozen in glycerol only , citrate-egg yolk-glycerol and tes-tris-citrate-egg yolk without glycerol ( tes-tris-citrate-iii ; p less than 0.01 ) .
C0007608
motility
C0007634
cells