Multiple alignment of two Aplysia’s aPKC mRNA isoforms (Aplysia californica aPKC and Aplysia californica aPKC isoform X1), two snail mRNA contigs (assembled from snail full-transcriptome sequencing data) homological to Aplysia’s aPKC mRNA (Helix lucorum aPKC contigs 1 and 2), two classic 5’RACE sequences (5’RACE full and 5’RACE short), and three RLM-5’RACE sequences (RLM-5’RACE aPKCΔC1, RLM-5’RACE aPKC X1, and RLM-5’RACE aPKC KD). The 3’-part of the sequence coding the catalytic domain is not shown because no 5′-RACE fragment aligned to it. Yellow coloring represents similarity to the common reference sequence Helix lucorum aPKC contig 1 (framed). Domains and features are located based on the information about Aplysia’s aPKC mRNA [36]. Red frames mark two possible translation starts present only in snail sequences.