There was an error published in the ePress version of Development136, 495-505 on the 17th December 2008.
The acknowledgements should have mentioned funding from the National Institutes of Health and the American Lebanese Syrian Associated Charities. The corrected acknowledgements section appears in full below. The final online and print versions are correct.
The authors apologise to readers for this mistake.
We thank K. Venner for technical assistance with electron microscopy, A. Cook for advice on E18.5 heart analysis, C. Shang for advice on the ChIP protocol, D. Kelberman for advice on the EMSA protocol, and D. Fürst(titin and α-actinin) and T. Obinata (MyBP-C) for antibodies. This work was funded by the British Heart Foundation, the Medical Research Council, and by R01-HL073402 (G.O.) from the National Institutes of Health and by the American Lebanese Syrian Associated Charities (ALSAC). Deposited in PMC for release after 12 months.