Assertion: adenosine's level | /r/HasProperty | reached by chronic use of arginine
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text: However, the level of efficacy reached by the chronic use of arginine alone remains uncertain (Boucharlat et al ., 1972 ; Zorgniotti & Lizza, 1994 ; Moody et al ., 1997 ; Klotz et al ., 1999 ; Chen et al ., 1999 ).