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Relative timing of cell fate decisions depends on lateral stabilization b and controls patterning. (a) For 
, symmetry breaking of X precedes super-induction of Y (
), resulting in chequerboard patterning (b = 15). (b) In contrast, for 
, super-induction of Y precedes symmetry breaking of X (
) and results in ubiquitous exocrine cell fates (b = 35). (Online version in colour.)
