7672
The offspring were followed through old age , with measurements taken at postnatal week 3 ( PNW3 ) , 41 ( PNW41 ) and 70 ( PNW70 ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None