  We present a vector field method for obtaining the spatial organization of 3D
patterns of gene expression based on gradients and lines of force obtained by
numerical integration. The convergence of these lines of force in local maxima
are centers of gene expression, providing a natural and powerful framework to
characterize the organization and dynamics of biological structures. We apply
this novel methodology to analyze the expression pattern of the Enhanced Green
Fluorescent Protein (EGFP) driven by the promoter of light chain myosin II
during zebrafish heart formation.
