Bag cell cluster release after exposure to insulin. MALDI MS spectra showing ELH-related peptides, including α-BCP(1–7) observed at m/z 922.6, α-BCP observed at m/z 1122.6, and AP at m/z 2959.6. (A) Pre-stimulation 0–30 min, (B) pre-stimulation 30–60 min, (C) stimulation 0–30 min, (D) stimulation 30–60 min, and (E) stimulation 60–90 min.