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Eighteen tail tendon fascicles were explanted from a 40-day postpartum rat and maintained in both serum-supplemented and serum-free Eagle's minimal essential medium for 2 weeks. Epitendon and paratendon connective tissues were excluded from these explants. Tendon fibroblasts maintained in serum-supplemented medium proliferated and synthesized collagen. Tendon fibroblasts explanted in serum-free medium remained viable but did not proliferate. Fibroblast growth factor and platelet-derived growth factor were shown to stimulate proliferation of mature tendon fibroblasts in serum-free medium.
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Larry Stein (1985) studied this question.
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