1389
During 8 days of culture under 5 % O ( 2 ) , but not room air , the addition of FGF2 to explants stimulated the formation of Gs - IB ( 4 - ) positive , CD31 - positive , and Flk - 1 - positive microvessels in a concentration - dependent manner .
 Anatomy: Gs - IB ( 4 - ) positive; Anatomy: CD31 - positive; Anatomy: Flk - 1 - positive microvessels
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: Gs - IB ( 4 - ) positive; Anatomy: CD31 - positive; Anatomy: Flk - 1 - positive microvessels