ATP2A2 and pulmonary arterial hypertension: However, in transient decay, the PAH group showed a 1.2-fold slower T50% than CTRL, while RES reduced this effect by 26% (Figure 1(f)); however, no significant differences were shown in the SERCA2/PLB ratio between the PAH and PAH+RES groups (Figure 1(g)), indicating that the improved T50% might have been due to increased SERCA activity rather than changes in its expression.