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U2 snRNA gene structure. Schematic representation of the U2-U5 snDNA cluster (A). The 3’ box and PSE of the U2 snRNA gene (B and E respectively) and of the U5 snRNA gene (C and D respectively), are detected by alignment with other fish sequences (gray boxes). Key: 3’: 3’ box; P1: PSE of U5 snRNA gene; P2: PSE of U2 snRNA gene; Pau: Pagrus auriga; Ppa: Pagrus pagrus; Dsa: Diplodus sargus; Dla: Dicentrarchus labrax; Dpu: Dicentrarchus punctatus; Pme: Plectorhinchus mediterraneus.
