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Convergent evolution of the ladder-like ventral nerve cord in Annelida.
Helm C, Beckers P, Bartolomaeus T, Drukewitz SH, Kourtesis I, Weigert A, Purschke G, Worsaae K, Struck TH, Bleidorn C. Helm C, et al. Among authors: drukewitz sh. Front Zool. 2018 Sep 27;15:36. doi: 10.1186/s12983-018-0280-y. eCollection 2018. Front Zool. 2018. PMID: 30275868 Free PMC article.