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Lengths of unique small RNA sequences from P. contorta (black bars, 58,466 sequences) and O. sativa (gray bars, 8615 sequences). The bulk of P. contorta small RNAs are 21 nt long with low variance (σ = 8.1). The rice sequences have a major peak at 24 nt and a minor peak at 21 nt, yielding a median of 22 nt and a higher variance (σ = 20.0). The 21-nt peak becomes more prominent when sequence degeneracy is considered (not shown).
