Patent ID: 7547525

Claim:
A method for determining whether a test compound solution induces progressive cell activity response comprising: placing the test compound solution in contact with a cell suspension media containing cells; diffusing the test compound solution into the cell suspension media from a point source, wherein a first cell of the cell suspension media is closer to the point source than a second cell of the cell suspension media; allowing the test compound solution to diffuse into the cell suspension media for a predetermined duration such that the first cell is exposed to the test compound solution longer than the second cell is exposed to the test compound solution; after the predetermined duration, detecting a degree of activity of the first cell and a degree of activity of the second cell; and comparing the degree of activity of the first cell to the degree of activity of the second cell to determine the presence or absence of a progressive cell activity response by the cells of the cell suspension media to determine whether a test compound solution induces progressive cell activity response.