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. Author manuscript; available in PMC: 2009 Nov 12.
Published in final edited form as: Nucleosides Nucleotides Nucleic Acids. 2008 Jun;27(6):755–760. doi: 10.1080/15257770802145678

Figure 1. Pathways of adenosine formation.

Figure 1

Adenosine can be generated intracellularly by the action of cytoplasmic 5’-nucleotidase (cNT) or S-adenosyl homocysteine hydrolase (SAHase), or extracellularly through the combined action of CD39 (ecto-apyrase) and ecto-5’-nucleotidase (CD73). AK, adenosine kinase; ADA, adenosine deaminase; PNP, purine nucleoside phosphorylase; Hx, hypoxanthine.