TABLE 1.

CASQ2^D307H restores tight jSR configuration in CASQ2 null myocytes

jSR profiles were visually classified as tight if the CASQ2 content of the jSR appeared clustered into small electron dense spots or loose if CASQ2 was either absent or not clustered. The majority of jSR profiles are tight in WT cells and loose in CASQ2 null cells. Values are shown as mean ± S.D. calculated for 100 jSR cisternae from 3 mice for each point.

Type	Tight jSR	Intermediate jSR	Loose jSR
		% of total
WT	93 ± 7a	7 ± 7	0
CASQ2 null	0	11 ± 12	89 ± 12b
CASQ2D307H	73 ± 16a	17 ± 11	10 ± 10b

^a Values are significantly different (Student's t test, p < 0.4.10⁻⁶).

^b Values are highly significantly different (Student's t test, p < 0.9.10⁻³⁴).