Assertion: adenosine's level | /r/HasProperty | pickard et al.
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text: In fact, the determination of NMBPR-specific binding sites has been used by different authors to quantify ENT1 expression at the plasma membrane, even long before ENT1 was identified at the molecular level (Pickard et al., 1973; Dahlig-Harley et al., 1981; Marangos et al., 1982).