The \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$${G}_{\rm{KrKs}}$$\end{document}GKrKs is smaller in patients with HF, consistent with potassium channel downregulation in HF30. The gene discussed is KCNA3; the disease is hydrops fetalis.