1. Bollner T, Beesley PW, Thorndyke MC (1993) Substance P- and cholecystokinin-like immunoreactivity during post-metamorphic development of the central nervous system in the ascidian Ciona intestinalis. Cell Tiss Res 272:545–552
2. Bollner T, Howalt H, Thorndyke MC, Beesley PW (1995) Regeneration and post-metamorphic development of the central nervous system in the protochordate Ciona intestinalis: a study with monoclonal antibodies. Cell Tiss Res 279:421–432
3. Burighel P, Cloney R (1997) Urochordata: Ascidiacea. In: Harrison FW, Ruppert EE (eds) Microscopic Anatomy of Invertebrates Vol.15 Hemichordate, Caetognatha, and the Invertebrate Chordates. Wiley-Liss Inc, New York, pp 221–347
4. Burighel P, Lane NJ, Zaniolo G, Manni L (1998) Neurogenic role of the neural gland in the development of the ascidian, Botryllus schlosseri (Tunicata, Urochordata). J Comp Neurol 394:230–241
5. Fedele M (1927) Ancora sulla organizzazione ele caratteristiche funzionali dell’ attivita nervosa dei tunicati. III. II si sterna nervoso vescerale. Atti dell’ Accademia Nazionale dei Lincei Rendiconti Ser 6 6:532–537