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Second trimester placental tissues were collected at the time of termination of pregnancy at 15 and 25 weeks of gestation ( in weeks of amenorrhea ) in trisomy 21 - affected pregnancies .
 Anatomy: placental tissues
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: placental tissues