Also known as somatopleure
The somatopleure is formed during embryonic development when the lateral plate mesoderm splits into two layers. The outer (or somatic) layer becomes applied to the inner surface of the ectoderm, and with it (partially) forms the somatopleure. The inner layer forms the splanchnopleure.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).