part_of part of part of results in assembly of cellular component assembly myofibril assembly cardiac myofibril assembly cardiac myofibril development GO:0055003 cardiac myofibril morphogenesis The process whose specific outcome is the progression of the cardiac myofibril over time, from its formation to the mature structure. A cardiac myofibril is a myofibril specific to cardiac muscle cells. biological_process heart myofibril assembly cardiac muscle cell development cardiac myofibril