1999
Staining of the normal mammary epithelium , if present , was much lower than observed in tumor cells from the same patient .
 Anatomy: mammary epithelium; Anatomy: tumor cells
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: mammary epithelium, tumor cells 
Answer:
 Anatomy: mammary epithelium; Anatomy: tumor cells