5046
Mast cells were found to be unique among the peritoneal leukocytes by virtue of their capacity to enhance profoundly the proliferation of a variety of tumors in vitro .
 Anatomy: Mast cells; Anatomy: peritoneal leukocytes; Anatomy: tumors
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
 Entities: Mast cells, peritoneal leukocytes, tumors 
Answer:
 Anatomy: Mast cells; Anatomy: peritoneal leukocytes; Anatomy: tumors