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
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: mammary epithelium; Anatomy: tumor cells