Size comparison of mutant cardiac titin and mutant skeletal titin. Hm skeletal titins from TA, LD, and GA are used to compare with Hm cardiac titin, showing that Hm skeletal titin is smaller than Hm cardiac titin. HLV, Hm left ventricle; TA, (from Hm); LD, (from Hm); GA, (from Hm); WLV, wild type left ventricle.