Inoue J, Nakashima K, Satoh N.

Genes (Basel). 2019 Apr 10;10(4). pii: E294. doi:10.3390/genes10040294

ORTHOSCOPE Analysis Reveals the Presence of the Cellulose Synthase Gene in All Tunicate Genomes but Not in Other Animal Genomes.

A second GH6 gene (with no CesA domain) was found in Tunicates.