Insulin tolerance tests (ITT) was performed in 3–4 h fasted Sprague-Dawley rats (age: 12 weeks). Following baseline blood glucose measurements, rats were injected with either lispro (0.014 mg kg−1) or mini-Ins (0.014 mg kg−1) intraperitoneally. Tail vein samples were obtained to assess blood glucose levels every 15 min over 150 min using a glucometer (Ascensia Contour BG monitors, Bayer HealthCare, IN). Animal protocols were approved by local IACUC committee.
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