You can find more information about histidine--tRNA ligase, putative using the following links:

PFID PFID Old Formal Annotation PlasmoDB TDR Targets Subcellular Localization Affecting Drugs
Drug Name PubMed Articles (year of publication)
PF3D7_0934000 PFI1645c histidine--tRNA ligase, putative PlasmoDB TDR
PF3D7_1445100 PF14_0428 histidine--tRNA ligase, putative PlasmoDB TDR
Expasy - NiceZime View
Brenda - The Comprehensive Enzyme Information System