Table 3. List of residues at the binding interface of Hb-Hp_β complex. ^* .

Residue	Frequency	Residue	Frequency
Hemoglobin α		Haptoglobin β
Val1	8	Ile1	8
Met76	8	Leu2	10
Asp94	7	Gly4	7
Pro95	10	His5	10
Val96	7	Leu6	10
Lys99	10	Asp7	10
Lys127	8	Ala8	10
Ala130	9	Lys9	10
Ser131	10	Ser11	9
Thr134	10	Val64	7
Val135	8	Glu99	8
Ser138	10	Arg125	10
Lys139	9	Lys130	10
Tyr140	8	Phe131	10
Arg141	10	Thr132	10
		Asp133	10
Hemoglobin β		His134	10
Pro36	8	Lys136	10
Trp37	10	Tyr137	9
Arg40	10	Pro158	8
Phe41	10	Lys160	10
Asp94	8	Lys161	7
His97	10	Gln186	10
Asp99	10	Glu187	10
Pro100	10	Asp188	7
Glu101	10	Tyr191	10
Asn139	10	Lys218	8
Ala142	9	Val222	8
His143	10
Lys144	10
Tyr145	10
His146	10

^*Residues in bold text are those also found in the Hb-Hp complex.