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Col type I expression on Day 2 in rat dental pulp MRPC-1 cells:(a) cells in control group (no agarose) showed weak anti-Col I activity; (b) border of Group 1 (agarose-no PP) also showed weak anti-Col I activity. The cells were scattered around the gel; (c) cells on the border of Group 3 (agarose-1 μg PP) showed strong anti-Col I activity; and (d) cells around the border of Group 4 gel (agarose-5 μg PP) showed mild anti-Col l activity. Scale bar = 100 μm for all frames.
