Table 1. Overview of variables, parameters and observables of the mathematical model (equation (2.1)).

	symbol	description	value
variables	X	expression of pro-endocrine transcription factor Ngn3	0 (initial)
	Y	expression of transcription factor Ptf1a	0 (initial)
		average Ngn3 expression in neighbouring cells	0 (initial)
		average Ptf1a expression in neighbouring cells	0 (initial)
parameters	a	strength of lateral inhibition	1
	b	strength of lateral stabilization	20
	c	strength of intracellular inhibition	1
	θ	external activation	0.1
	n	Hill coefficient	4
	ηx	amplitude of Gaussian white noise on X	10−4
	ηy	amplitude of Gaussian white noise on Y	0
observables	τx	time until symmetry break in X
	τy	time until super-induction of Y
	ε	ratio of endocrine cells