The antigen is a trimer, and there are 3 "correct answers" to this docking problem.

NOTE THAT IN THE ALIGNMENTS BELOW, GAPS MOST LIKELY INDICATE
RESIDUES MISSING IN THE ELECTRON DENSITY.
Alignment: 1I9R_H against 1I9R_H
Query= 
         (219 letters)

>1I9R_H
          Length = 219

 Score =  442 bits (1137), Expect = e-129
 Identities = 219/219 (100%), Positives = 219/219 (100%)

Query: 1   QVQLVQSGAEVVKPGASVKLSCKASGYIFTSYYMYWVKQAPGQGLEWIGEINPSNGDTNF 60
           QVQLVQSGAEVVKPGASVKLSCKASGYIFTSYYMYWVKQAPGQGLEWIGEINPSNGDTNF
Sbjct: 1   QVQLVQSGAEVVKPGASVKLSCKASGYIFTSYYMYWVKQAPGQGLEWIGEINPSNGDTNF 60

Query: 61  NEKFKSKATLTVDKSASTAYMELSSLRSEDTAVYYCTRSDGRNDMDSWGQGTLVTVSSAS 120
           NEKFKSKATLTVDKSASTAYMELSSLRSEDTAVYYCTRSDGRNDMDSWGQGTLVTVSSAS
Sbjct: 61  NEKFKSKATLTVDKSASTAYMELSSLRSEDTAVYYCTRSDGRNDMDSWGQGTLVTVSSAS 120

Query: 121 TKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGL 180
           TKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGL
Sbjct: 121 TKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGL 180

Query: 181 YSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPK 219
           YSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPK
Sbjct: 181 YSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPK 219


Alignment: 1I9R_L against 1I9R_L
Query= 
         (215 letters)

>1I9R_L
          Length = 215

 Score =  436 bits (1120), Expect = e-127
 Identities = 215/215 (100%), Positives = 215/215 (100%)

Query: 1   DIVLTQSPATLSVSPGERATISCRASQRVSSSTYSYMHWYQQKPGQPPKLLIKYASNLES 60
           DIVLTQSPATLSVSPGERATISCRASQRVSSSTYSYMHWYQQKPGQPPKLLIKYASNLES
Sbjct: 1   DIVLTQSPATLSVSPGERATISCRASQRVSSSTYSYMHWYQQKPGQPPKLLIKYASNLES 60

Query: 61  GVPARFSGSGSGTDFTLTISSVEPEDFATYYCQHSWEIPPTFGGGTKLEIKRTVAAPSVF 120
           GVPARFSGSGSGTDFTLTISSVEPEDFATYYCQHSWEIPPTFGGGTKLEIKRTVAAPSVF
Sbjct: 61  GVPARFSGSGSGTDFTLTISSVEPEDFATYYCQHSWEIPPTFGGGTKLEIKRTVAAPSVF 120

Query: 121 IFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLS 180
           IFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLS
Sbjct: 121 IFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLS 180

Query: 181 STLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNR 215
           STLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNR
Sbjct: 181 STLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNR 215


Alignment: 1I9R_A against 1ALY_A
Alignment: 1I9R_B against 1ALY_B
Alignment: 1I9R_C against 1ALY_C