Angelini, C, B Baccetti, P Piomboni, S Trombino, MG Aluigi, S Stringara, L Gallus, and C Falugi. 2009. “Acetylcholine Synthesis and Possible Functions During Sea Urchin Development”. European Journal of Histochemistry 48 (3):235-44. https://doi.org/10.4081/892.