SEARCH Articles Figures Tables Activation of PE Residues with Heterobifunctional Crosslinkers Alkaline Phosphatase Conjugation to Cystamine-Modified DNA Using Amine- and Sulfhydryl-Reactive Heterobifunctional Crosslinkers Crosslinking reagents heterobifunctional Heterobifunctional NHS Ester-Maleimide Heterobifunctional Crosslinker-Mediated Hapten-Carrier Conjugation