Notch

Notch is an agent-based modeling system designed for predictive modeling of complex biological systems and biophysical interactions at the nano and micro scales. It utilizes gaming and three-dimensional visualization tools to create dynamic simulations of cellular interactions, particularly focusing on juxtacrine signaling between neighboring cells.

Key features and advantages of Notch include:

1. Ability to apply any cell geometry to the model
2. Real-time visualization of molecule diffusion and interactions within cells
3. Insight into emergent behavior of biological systems through dynamic simulations

The authors validated the agent-based model against a mean-field model of Notch receptors and ligands in neighboring cells. They also demonstrated the model's advantages by creating a filopodium-mediated signaling model. This model revealed that diffusion and endocytosis alone are insufficient for significant signaling in filopodia due to bottlenecks at the cell-filopodium contact region and the long distance to the end of the filopodium. However, ligands' active transport into filopodia enhanced signaling significantly compared to a face-to-face scenario.