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MicroRNA family copy number in P. tepidariorum and other ecdysozoans. Presence of P. tepidariorum single-copy and multicopy microRNA families in other spiders (purple), scorpions (magenta), horseshoe crab (blue) parasitiformes (green), acariformes (dark green), mandibulates (gray), and a nematode (black). The spiders, the scorpion, and the horseshoe crab all display large numbers of multi-copy microRNA families relative to other species.
