Before revision:  The complementary "kissing" duplex loops , like RNA codon-anticodon k-mer duplexes , would seed a more extensive pairing interaction that would then extend until limited by lack of homology or other factors.
After revision:  The complementary "kissing" duplex loops , like RNA codon-anticodon k-mer duplexes - would seed a more extensive pairing interaction that would then extend until limited by lack of homology or other factors.