Chapter 21
Pattern Formation as Boundary Field Interaction

Certain biological patterns arise from the interaction of chemical reactions and diffusion processes.
When substances react and spread through tissue simultaneously, stable spatial patterns can emerge.

This chapter examines reaction–diffusion systems, first described by Alan Turing, as mechanisms that generate repeating biological patterns such as stripes, spots, and developmental structures.

Developing organisms rely on chemical gradients that vary across space.
Cells detect their position within these gradients and adjust their behaviour accordingly.

This chapter explores gradient fields as spatial signalling systems that guide cellular differentiation and coordinated development.

Cells determine their developmental roles by interpreting signals from their surrounding environment.
Through signalling molecules and regulatory networks, cells gain information about their location within the organism.

This chapter examines positional encoding as the process by which biological systems translate spatial information into organised developmental outcomes.