1244
The volume fraction ( Vv ) and number / mm2 ( Na ) of all capillaries ( perfused and nonperfused ) in a given area of brain were determined after staining for alkaline phosphatase .
 alkaline phosphatase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 alkaline phosphatase