code: public int equivalenceCode()
  	{
  		int result = 29 + (TAXON_XREF != null ? TAXON_XREF.hashCode() : 0);
  		result = 29 * result + (CELLTYPE != null ? CELLTYPE.hashCode() : 0);
  		result = 29 * result + (TISSUE != null ? TISSUE.hashCode() : 0);
  		return result;
  	}
docs: ------------------------ CANONICAL METHODS ------------------------