highly significantp < 10 −9
De novo MEME analysis (Figure S2A ) reveals that Round 25 aptamers overwhelmingly share a single, contiguous motif that extends across nearly the entire 40‐nt core, with RTAR and its closest relatives showing highly significant full‐length matches ( p < 10 −9 ), whereas the less enriched clusters display only truncated or offset hits to secondary motifs.