Atrial Activity Present
![Atrial activity in a substrate of size 4 8 cm with mean [ACh] of 7.5 nM ...](https://www.researchgate.net/profile/Stanley-Nattel/publication/7888887/figure/fig3/AS:667824439689219@1536233162042/A-atrial-activity-recorded-from-a-low-ACh-zone-in-a-substrate-of-size-4-8-cm-with-mean_Q320.jpg "Atrial Activity Present")
![Atrial activity in a substrate of size 4 8 cm with mean [ACh] of 7.5 nM ...](https://www.researchgate.net/publication/7888887/figure/fig1/AS:421881477111811@1477595790799/Atrial-activity-in-a-substrate-of-size-4-8-cm-with-mean-ACh-of-75-nM-and-ACh.png "Atrial Activity Present")
![Atrial activity in a substrate of size 4 8 cm with mean [ACh] of 7.5 nM ...](https://www.researchgate.net/profile/Stanley-Nattel/publication/7888887/figure/fig1/AS:421881477111811@1477595790799/Atrial-activity-in-a-substrate-of-size-4-8-cm-with-mean-ACh-of-75-nM-and-ACh_Q320.jpg "Atrial Activity Present")
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