- Adenosine A(2A) receptors are expressed in human atrial myocytes and modulate spontaneous sarcoplasmic reticulum calcium release. Hove-Madsen, L., Prat-Vidal, C., Llach, A., Ciruela, F., Casad??, V., Lluis, C., Bayes-Genis, A., Cinca, J., Franco, R. Cardiovasc. Res. (2006)