The cell ontology (CL) follows certain conventions regarding taxon constraints. Please review the following pages before adding taxon constraints to CL terms.

Explanation of taxon constraints can be found here: https://oboacademy.github.io/obook/explanation/taxon-constraints-explainer/

A how-to guide can be found here: https://oboacademy.github.io/obook/howto/add-taxon-restrictions/