Gierer-Meinhardt

Activator-Inhibitor · Turing Instability · Spot & Stripe Patterns

D_h / D_a ratio 20

Production rate ρ 0.02

Decay μ_h 0.03

∂a/∂t = D_a∇²a + ρa²/h − μ_a·a | ∂h/∂t = D_h∇²h + ρa² − μ_h·h. Turing condition: D_h >> D_a (inhibitor diffuses faster). Activator (green) forms spots/stripes; inhibitor (suppressed region) enforces spacing.