MYH7 and hydrops fetalis: Therefore, we quantified mRNA abundance of alpha 1 actin (Acta1) beta actin (Actb), myosin heavy chain 6 (Myh6) myosin heavy chain 7 (Myh7) sarco/endoplasmic reticulum Ca2+ −ATPase (SERCA2) and phospholamban (Pln) to assess the induction of the PGP in hearts from LF- and HF-fed postpartum and nulliparous mice.