code: public boolean isIdenticalTo(SubunitCluster other) {
  		String thisSequence = this.subunits.get(this.representative)
  				.getProteinSequenceString();
  		String otherSequence = other.subunits.get(other.representative)
  				.getProteinSequenceString();
  		return thisSequence.equals(otherSequence);
  	}
docs: Tells whether the other SubunitCluster contains exactly the same Subunit.
  This is checked by String equality of their residue one-letter sequences.
  
  @param other
  SubunitCluster
  @return true if the SubunitClusters are identical, false otherwise