Table 1.

Parameters of TT network as measured and/or calculated (italicized) from V:SA datasets. Numbers give mean ± SEM. Mann-Whitney test for significance is shown as ** where p < 0.001.

Parameter	Rabbit	Mouse
n (cells/hearts)	11/3	12/3
V:SA	0.139 ± 0.007	0.066 ± 0.006**
Diameter, DTT(μm)	0.356 ± 0.018	0.169 ± 0.015**
Skeleton length (μm/μm3)	0.27 ± 0.02	0.70 ± 0.04**
Transverse tubules (%)	63 ± 4	37 ± 1**
TT membrane abundance (μm2/μm3)	0.30	0.37
TT volume as % cell volume	2.5	1.6
% Cell membrane in TT	65	51