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One theoretical possibility is that mast cells may prepare the matrix , perhaps by slow release of heparin , so that capillary sprouts can more easily move through it toward their angiogenic target .
 Anatomy: mast cells; Anatomy: matrix; Anatomy: capillary sprouts
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: mast cells; Anatomy: matrix; Anatomy: capillary sprouts