sequence motif
nucleotide or amino-acid sequence pattern that is widespread and has, or is conjectured to have, a biological significance. For proteins, a sequence motif is distinguished from a structural motif
repetitive DNA
patterns of nucleic acids (DNA or RNA) that occur in multiple copies throughout the genome
stem-loop
intramolecular base-pairing pattern in RNA and also DNA
tandem repeat
DNA where one or more nucleotides are repeated and the repetitions are directly adjacent
G-quadruplex
secondary structures formed in nucleic acids by sequences that are rich in guanine