Proximity: Ingredients close together have similar semantic relationships in the knowledge graph embedding space
Color & shape: Categorical grouping (default: mapping status - blue filled circle = mapped, orange hollow ring = unmapped)
Unmapped Ingredients: Complex mixtures (e.g., "Allen Medium", "Biotin Vitamin Solution") without single chemical entity embeddings - shown with synthetic embeddings near cluster center
Size: Metric of interest (default: total occurrences across media recipes)
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