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.
The filaments of myofibrils, myofilaments, consist of two types, thick and thin: 1  Thin filaments consist primarily of the protein actin, coiled with nebulin filaments.2  Actin, when polymerized into filaments, forms the ladder along which the myosin filaments climb to generate motion. Thick filaments consist primarily of the protein myosin, held in place by titin filaments. 2  Myosin is responsible for force generation. 3  It is composed of a globular head with both ATP and actin binding sites, and a long tail involved in its polymerization into myosin filaments.