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>2BL2A H1-H2 MMDYLITQV GMVFAVLAMATATIFSGIGSAKGVGMTGEAAAALTT ... L--V I--V M--V
>2BL2A H1 MMDYLITQV ... MV 2-->6 ##M=2 from H1 V=3 from H6 2x3=6 LV 1-->8 ## L=1 from H1 V=3 from H6 1x3=3 L=5 from H6 V=1 from H1 +5x1=5 3+5=8 possible interactions IV 1-->7