id | GO:0042600   Detailed information
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  name | chorion
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  namespace | cellular_component
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  def | "A protective, noncellular membrane that surrounds the eggs of various animals including insects and fish." [GOC:jl, ISBN:0721662544]
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  comment | Note that this term does not refer to the extraembryonic membrane surrounding the embryo of amniote vertebrates as this is an anatomical structure and is therefore not covered by GO.
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  subset | goslim_pir
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  is_a | GO:0030312 ! external encapsulating structure
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