Table I. Twitch and tetanic tension of hindlimb muscles from wild-type and JP-1 knockout neonatal mice.
| Twitch | Tetanus | |
|---|---|---|
| mg/mm2 | ||
| Wild-type muscle | 22.4 ± 3.5 | 52.0 ± 8.3 |
| JP-1–deficient muscle | 11.2 ± 1.8a | 49.4 ± 7.0 |
Data (mean ± SEM) were derived from at least eight muscle preparations from six mice and each value was normalized by cross-sectional surface area of the muscle bundle. Twitch and tetanic responses were evoked by electrical stimuli at 0.33 and 30 Hz, respectively.
a
Indicates statistical difference (P , 0.01 in t test).