public void setAnnotation(String str) {
    if (str != null) {
      annotation = str;
      isAnnotationHere = true;
    } else {
      annotation = null;
      isAnnotationHere = false;
    }
  }
public void setAnnotation(String str) {
    if (str != null) {
      annotation = str;
      isAnnotationHere = true;
    } else {
      annotation = null;
      isAnnotationHere = false;
    }
  }
public void setAnnotation ( String str ) { if ( str != null ) { annotation = str ; isAnnotationHere = true ; } else { annotation = null ; isAnnotationHere = false ; } }
method to add annotation to this monomer

@param str annotation
method to add annotation to this monomer