Figure 4

Relationship between CrT mRNA and total creatine (A) and between CrT mRNA and creatine uptake (B), indicated by Pearson's correlation coefficient. Each data point (mean ± S.E.) represents a different developmental age from -2, 7, 13, 21, 33, 50 and 80 days post-partum. CrT mRNA and total creatine data were collected from the same hearts, whereas creatine uptake data was collected from different hearts. There are no data points in (B) for days -2 and 7 since it was not possible to measure creatine uptake in these very small hearts.