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Left bundle branch block (LBBB) is a cardiac conduction abnormality seen on the electrocardiogram (ECG). In this condition, activation of the left ventricle is delayed, which causes the left ventricle to contract later than the right ventricle.
Gene locus [edit]. HBB protein is produced by the gene HBB which is located in the multigene locus of Î²-globin locus on chromosome 11, specifically on the short arm position 15.5.t is 146 amino acids long and has a molecular weight of 15,867 Da. Normal adult human HbA is a heterotetramer consisting of two alpha chains and two beta chains. HBB is encoded by the HBB gene on human chromosome 11.