Interactions between ORs and odorants are perplexed. A single OR can bind to multiple odorants, on the other hand a single odorant can provoke a response from more than one OR, thus leading to a unique combination of ORs for each odorant.

OlfactionBase contains 875 OR-odorant interaction pairs for Humans and Mus musculus. The odorant-OR pairs in OlfactionBase include 197 odorants, 69 receptors and 409 associations among Humans and 133 ligands, 81 receptors and 466 associations among Mus musculus.

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