Table 1. Cycle to threshold (Ct) Values of cardiac and skeletal muscle transcription factor and structural muscle protein gene expression of Embryonic day 13 (ED13) ventricular myocardium and skeletal muscle (limbs).

	Beta Actin	Nkx2.5	GATA4	MyoD	Myogenin	MYH6	MYH4	cTn-I
Skeletal Muscle	14.5±0.2	25.8±0.1	28.6±0.4	22.5±0.5	20.8±0.0	23.4±0.6	28.9±0.3	22.9±0.0
Heart	15.8±0.1	21.1±0.2	24.5±0.2	32.5±0.2	27.9±0.1	34.1±1.6	36.1±0.9	16.3±0.1

Although expression levels vary between both types of tissue, their transcriptional and structural gene profiles overlap.