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NP cells observed under an inverted phase contrast microscope. (a) NP cells cultured on day 5. (b) NP cells cultured on day 9. (c) NP cells cultured on day 15. (d) NP cells cultured on day 25. (e) Passage 3 NP cells loaded with cyclic mechanical stretch. (f) Passage 3 NP cells of the control group.
