There were positive correlations ( P 0 . 01 ) between two bands , B4 ( 67 kDa ) and B5 ( 58 . 6 kDa ) , and sperm motility ( r = 0 . 66 and r = 0 . 46 ) , sperm vigor ( r = 0 . 56 and r = 0 . 66 ) , percentage of morphologically normal spermatozoa ( r = 0 . 55 and r =