Summary of all acute reserpine application experiments and adrenergic receptor (AR) agonist stimulated recovery (from Fig. 6A–C).

Shown are the numbers of control EBs and their responses during: 1. Reserpine: Acute Reserpine application (e.g. EBs responding by negative chronotropy, stop of beating, etc.). 2. AR Agonist: AR Agonist stimulation following reserpine application (EBs which reacted with positive (yes), neutral (no) or very weak (undefined) chronotropy). 3. Washout: After repeated medium changes (showing recovery toward baseline beating rate). Altogether 16 EBs were tested and their responses are further represented as overview (bottom row).