• Microfibrils are aggregations (กลุ่มก้อน) of cellulose molecules into
thread-like structures approximately 3.5 mm in diameter,
containing both crystalline and amorphous regions.
• Microfibrils occur in the secondary cell wall.
• Microfibrils are oriented in different directions in each of the three
layers within the secondary cell wall; the fibril angle is measured
from the longitudinal axis of the cell.