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Chorion - Wikipedia
Chorion: Anatomy and function - Kenhub
Fetal membranes - Wikipedia
Chorion - Definition, Explanation & Function - Biology Dictionary
Amnion vs. Chorion: 5 Key Differences, Pros & Cons,
Difference Between Amnion and Chorion
Chorion - Biology Simple
Chorion | Fetal Membrane, Placental Development & Maternal …
Chorion - Definition and Examples - Biology Online Dictionary
Chorion - SpringerLink