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Retention of HB-IGF-1 in vivo. Western blot showing retained IGF-1 (IGF) or HB-IGF-1 (HB-IGF) in rat articular cartilage, meniscus, patella, patellar tendon, or muscle extracts one day after intra-articular injection of IGF-1, HB-IGF-1, or saline.
