Chemokine Field Map: Neutrophil Chemotaxis & NETosis

A 2D reaction-diffusion grid stands in for the immune battlefield: bacteria at an infection site continuously feed a chemokine field that diffuses and decays across the arena, rendered live as a heatmap. Neutrophils never see the bacteria directly — they sample the field's finite-difference gradient and climb it with a biased random walk, exactly the leukocyte chemotaxis law from the 3D version, but measured off a genuinely simulated PDE instead of an analytic point-source sum. Phagocytosis, NETosis and the live readouts behave identically to the original — tune severity, recruitment, chemotactic sensitivity and the NETosis threshold and watch the field and the response evolve together.