12457
Heparin ( 100 U . kg ( - 1 ) . day ( - 1 ) ) was injected subcutaneously to the rats in H group while normal saline to those in N group once a day .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None