2053
While in the fetuses , the concentration of label per gram of tissue remained remarkably constant throughout the study .
 Anatomy: fetuses; Anatomy: tissue
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: fetuses, tissue 
Answer:
 Anatomy: fetuses; Anatomy: tissue