question: returns the domain key of the peptide . concode_field_sep double iDomainNextScore concode_elem_sep String iDownFlankSequence concode_elem_sep double iDomainDeltaMz concode_elem_sep int iMissedCleavages concode_elem_sep int iDomainEnd concode_elem_sep String iDomainID concode_elem_sep double iDomainHyperScore concode_elem_sep String iUpFlankSequence concode_elem_sep String proteinKey concode_elem_sep String iDomainSequence concode_elem_sep double iDomainExpect concode_elem_sep double iDomainMz concode_elem_sep String domainKey concode_elem_sep int iDomainStart concode_field_sep double getDomainNextScore concode_elem_sep void setDomainID concode_elem_sep int getDomainEnd concode_elem_sep void setDomainEnd concode_elem_sep void setDomainDeltaMh concode_elem_sep void setProteinKey concode_elem_sep double getDomainDeltaMh concode_elem_sep int getMissedCleavages concode_elem_sep void setDomainKey concode_elem_sep double getDomainMh concode_elem_sep void setDomainMh concode_elem_sep void setDomainNextScore concode_elem_sep void setDownFlankSequence concode_elem_sep void setDomainHyperScore concode_elem_sep void setMissedCleavages concode_elem_sep int getDomainStart concode_elem_sep void setDomainExpect concode_elem_sep double getDomainHyperScore concode_elem_sep void setUpFlankSequence concode_elem_sep void setDomainStart concode_elem_sep String getProteinKey concode_elem_sep double getDomainExpect concode_elem_sep String getUpFlankSequence concode_elem_sep void setDomainSequence concode_elem_sep String getDownFlankSequence concode_elem_sep String getDomainSequence concode_elem_sep String getDomainID
target: String function ( ) { return domainKey ; }