+ * The main panel of an AlignFrame, containing holders for the IdPanel,
+ * SeqPanel, AnnotationLabels (a JPanel), and AnnotationPanel.
+ *
+ * Additional holders contain an IdPanelWidthAdjuster space above the idPanel,
+ * AnnotationScroller (JScrollPane for AnnotationPanel), and vertical and
+ * horizontal scrollbars.
+ *
+ *