摘要: REIS1–4 has demonstrated the presence of a phosphatase in various tissues specifically hydrolysing 5-nucleotides, for example, adenosine-5-phosphate. One us previously reported5 that normal blood serum low 5-nucleotidase activity corresponding to about 1/10 its non-specific alkaline towards glycerophosphate. In bone diseases where is raised, may be normal; but jaundice, either infective or obstructive, both enzyme levels increased, those sometimes exceeding phosphatase.