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Table 2.

Mean (±s.d.) citrate synthase (CS) activity [μmol of substrate converted to product min–1 (international units)g–1 wet mass of tissue] at 20°C in opah extraocular muscles

NExtraocular muscleCitrate synthase activity (units g–1)
Lateral rectus, proximal portion 36.13±18.6 
Lateral rectus, distal portion 3.65±1.62 
Superior rectus 6.54±2.05 
Inferior rectus 5.42±3.20 
10 Medial rectus 13.13±3.85 
Medial rectus, proximal portion 12.46 
Superior oblique 7.33±5.34 
Inferior oblique 3.22±1.40 
NExtraocular muscleCitrate synthase activity (units g–1)
Lateral rectus, proximal portion 36.13±18.6 
Lateral rectus, distal portion 3.65±1.62 
Superior rectus 6.54±2.05 
Inferior rectus 5.42±3.20 
10 Medial rectus 13.13±3.85 
Medial rectus, proximal portion 12.46 
Superior oblique 7.33±5.34 
Inferior oblique 3.22±1.40 

CS activity is significantly higher in the proximal portion of the lateral rectus muscle (LRM) than in the distal portion of the LRM, the superior rectus, inferior rectus, superior oblique and inferior oblique muscles (ANOVA, P<0.05). In addition, the medial rectus muscle has a significantly higher CS activity than the inferior oblique muscle (ANOVA, P<0.05)

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