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  • Title: The concentration of carnitine in the luminal fluid of the testis and epididymis of the rat and some other mammals.
    Author: Hinton BT, Snoswell AM, Setchell BP.
    Journal: J Reprod Fertil; 1979 May; 56(1):105-11. PubMed ID: 469829.
    Abstract:
    Luminal fluid was collected by micropuncture techniques from the testis and epididymis of the rat, hamster, rabbit, boar and ram and the concentration of free L-carnitine in the fluid was estimated using enzymic methods. Carnitine was present in the testicular fluid of the rat in concentrations less than 1 mM but increased down the epididymis to reach 53 mM in luminal fluid from the cauda epididymidis, approximately 2000 times higher than in blood plasma. A high concentration was first found in the luminal fluid from the distal caput epididymidis, at about the point where the spermatozoa become motile. Carnitine was also present in the epididymal luminal fluid of the other species studied; the amounts were not as high as those in the rat but were still higher than those in blood plasma.
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