On what days can I transfect and analyze cardiomyocytes?

Generally, iCell^® Cardiomyocytes are ready to transfect on day 7 post-plating and to analyze on day 8.

References:

1. Anson BA (2015) iPSC-derived Tissue Cells Are a Powerful Addition to the Biologist’s Tool Box
2. Application Note: Applying Transfection Technologies to Create Novel Screen Models 
3.  Application Protocol: Using Liposome-mediated Transfection for Gene Delivery
4.  Application Protocol: Using Transfection for siRNA Delivery Application Protocol