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How do cells know when they’re fully grown?

Scientists unlock the key to cell size regulation – and it’s all in the DNA.

The image shows a shoot apical meristem (at the centre) with floral buds emerging on its flanks. Cells marked in green are about to enter DNA replication, whilst the magenta marker shows accumulation of KRP4, which is part of the mechanism that regulates cell size. Credit: John Innes Centre