phenotype affects entity I band abnormal sarcomere morphology abnormal I band morphology 2018-05-10T08:02:41Z abnormal I band abnormal I disc abnormal J disk abnormal isotropic disk abnormal isotropic band any structural anomaly of the light band on each side of the Z disc (aka Z line), comprising a region of the sarcomere where thin (actin) filaments are not overlapped by thick (myosin) filaments; the I band is isotropic to polarized light and contains actin, troponin, and tropomyosin; each sarcomere includes half of an I band at each end abnormal isotropic disc MPheno.ontology MP:0030567 abnormal I disk abnormal I-band morphology abnormal J disc morphology of I band phenotype