def geneplot_mhat(df, markeridcol, chr, pv, gwasp, markernames, gfont, gstyle, ax):
    if markeridcol is not None:
        if markernames is not None and markernames is True:
            for i in df[markeridcol].unique():
                if df.loc[df[markeridcol] == i, pv].iloc[0] <= gwasp:
                    if gstyle == 1:
                        plt.text(df.loc[df[markeridcol] == i, 'ind'].iloc[0], df.loc[df[markeridcol] == i, 'tpval'].iloc[0],
                                str(i), fontsize=gfont)
                    elif gstyle == 2:
                        plt.annotate(i, xy=(df.loc[df[markeridcol] == i, 'ind'].iloc[0], df.loc[df[markeridcol] == i, 'tpval'].iloc[0]),
                                     xycoords='data', xytext=(5, -15), textcoords='offset points', size=6,
                                     bbox=dict(boxstyle="round", alpha=0.2),
                                     arrowprops=dict(arrowstyle="wedge,tail_width=0.5", alpha=0.2, relpos=(0, 0)))
        elif markernames is not None and isinstance(markernames, (tuple, list)):
            for i in df[markeridcol].unique():
                if i in markernames:
                    if gstyle == 1:
                        plt.text(df.loc[df[markeridcol] == i, 'ind'].iloc[0], df.loc[df[markeridcol] == i, 'tpval'].iloc[0],
                            str(i), fontsize=gfont)
                    elif gstyle == 2:
                        plt.annotate(i, xy=(df.loc[df[markeridcol] == i, 'ind'].iloc[0], df.loc[df[markeridcol] == i, 'tpval'].iloc[0]),
                                     xycoords='data', xytext=(5, -15), textcoords='offset points', size=6,
                                     bbox=dict(boxstyle="round", alpha=0.2),
                                     arrowprops=dict(arrowstyle="wedge,tail_width=0.5", alpha=0.2, relpos=(0, 0)))
        elif markernames is not None and isinstance(markernames, dict):
            for i in df[markeridcol].unique():
                if i in markernames:
                    if gstyle == 1:
                        plt.text(df.loc[df[markeridcol] == i, 'ind'].iloc[0], df.loc[df[markeridcol] == i, 'tpval'].iloc[0],
                             markernames[i], fontsize=gfont)
                    elif gstyle == 2:
                        plt.annotate(markernames[i], xy=(
                        df.loc[df[markeridcol] == i, 'ind'].iloc[0], df.loc[df[markeridcol] == i, 'tpval'].iloc[0]),
                                     xycoords='data', xytext=(5, -15), textcoords='offset points', size=6,
                                     bbox=dict(boxstyle="round", alpha=0.2),
                                     arrowprops=dict(arrowstyle="wedge,tail_width=0.5", alpha=0.2, relpos=(0, 0)))
    else:
        raise Exception("provide 'markeridcol' parameter")