In 2015 Illinois will again process all appointment renewals electronically through the National Insurance Producer Registry (NIPR). 1  Appointment renewal date is November 1, 2015. 2  Appointment renewals will be electronically processed through NIPR.
myofibril - one of many contractile filaments that make up a striated muscle fiber. myofibrilla, sarcostyle. sarcoplasm - the cytoplasm of a striated muscle fiber. striated muscle cell, striated muscle fiber - an elongated contractile cell in striated muscle tissue.
Muscle cells have evolved to carry out one highly specialized functionâââcontraction. Muscle contractions must occur quickly and repetitively, and they must occur through long distances and with enough force to move large loads. myofiber is packed with myofibrils, bundles of filaments that extend the length of the cell. Myofibrils are further subdivided into alternating light and dark bands, which are aligned along the length of the muscle cell, giving the myofiber a striated appearance in the light microscope.