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441. Compartments and Polyclones in Insect Development

442. Obituary of Jacques Monod

443. Linking Numbers and Nucleosomes

444. A Speculation on the Origin of Protein Synthesis

445. Higher-Order Structure of Human Mitotic Chromosomes

446. Developmental Biology

447. Split Genes and RNA Splicing

448. Is DNA Really a Double Helix?

449. Selfish DNA: The Ultimate Parasite

450. Selfish DNA [Editorial letter]