Figure 1.

1A. Skeleton muscle (biceps femoris) histological section of pigs with/without the administration of clenbuterol. 1. transverse, test pigs. 2. transverse, control pigs. 3. longitudinal, test pigs. 4. longitudinal, control pigs. Vertical fiber sections analyzed with TD2000 real-color pathology image analysis system (Beijing Tiandibainian Scientific Company Ltd.). The muscle fibers of pigs become thicker when treated with clenbuterol. 1B. Subcutaneous back fat (at the fifth lumbar vertebra level) histological section of pigs with/without the administration of clenbuterol. 1. amplified10 × 10 of test pigs. 2. amplified 10 × 10 of control pigs. 3. amplified 10 × 40 of test pigs. 4. amplified 10 × 40 of control pigs. The sizes of the pig adipose cells decreased when treated with clenbuterol. The cell size was analyzed by counting cells on the slide visible through the microscope eyepiece.