Franchini A, Ottaviani E, Caselgrandi E
Brain Res. 1985 Nov 11;347(1):132-4. doi: 10.1016/0006-8993(85)90899-6.
The presence of biogenic amines is demonstrated in the central nervous system of Helicella virgata using a modified glyoxylic acid technique and high-performance liquid chromatography.