NATURE

NATURE

What were the first animals? The fierce sponge–jelly battle that just won’t end

Which animals came first? For more than a century, most evidence suggested that sponges, immobile filter-feeders that lack muscles, neurons and other specialized tissues, were the first animal lineages to emerge. Then, in 2008, a genomic study pointed to a...

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Random heteropolymers as enzyme mimics

Breslow, R. Artificial enzymes. Science 218, 532–537 (1982).Article  ADS  PubMed  CAS  Google Scholar  DeGrado, W. F., Wasserman, Z. R. & Lear, J. D. Protein design, a minimalist approach. Science 243, 622–628 (1989).Article  ADS  PubMed  CAS  Google Scholar  Kuhlman, B. et...

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