By looking at the genome of the Choanoflagellate, " Monosiga brevicollis ", scientists have inferred that choanoflagellates play a key role in the development of multicellularity.
2.
This lineage has been deleted in protostomes, together with its upstream pathway components ( MEKK2 / 3, MKK5 ), although they are clearly present in cnidarians, sponges and even in certain unicellular organisms ( e . g . the choanoflagellate " Monosiga brevicollis " ) closely related to the origins of multicellular animals.
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