Northern analysis of AMRP mRNA. A,Methylene blue-stained Northern blot of total RNA isolated from the five different ganglia of Aplysia californica showing equal loading in all lanes. Aplysia ribosomal RNA runs as a single 18 S band. B, Hybridization of the same blot with AMRP coding sequence probe. Kb, Kilobase;M, RNA size marker; B, buccal ganglion;C, cerebral ganglion; L, pleural ganglion; E, pedal ganglion; A, abdominal ganglion.