8351
Histological analyses revealed that cardiac hypertrophy and macrophage infiltration in PAH mice at E19 were improved in both lactating and NL groups at 4 weeks postpartum ( 4W - PP ) , while marked fibrosis remained .
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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