1. A method of extracting desired features from a cellular image comprising the steps of: (a) Selecting an initial cell within said image; (b) Selecting an additional cell, near said initial cell, appearing to be associated with a desired feature; (c) Repeating step (b) for further cells, near at least one of said previously selected cells, appearing to be associated with said feature, until selection termination criteria are satisfied; and (d) Repeating steps (a) through (c) for other initial cells.