Upregulated features.

        {threshdoc}

def upregulated(self, thresh=0.05, idx=True):
        """
        Upregulated features.

        {threshdoc}
        """
        ind = (
            (self.data[self.pval_column] <= thresh)
            & (self.data[self.lfc_column] > 0)
        )
        if idx:
            return ind
        return self[ind]