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Ultrasonography of VX2 tumor growth in vivo. (A) B-mode US images of a VX2 tumor in the neck of a rabbit at different times (days 7, 14, and 21 postimplantation). The extent of the tumor is outlined in white. (B) Bar graph shows US-based estimates of tumor volume in rabbits (n = 9) over a 3-week period. **P < .01; ***P < .001.
