correction

d1iqda1 strand#7 should be devided to 7 and 7', and it will be 1A not 1B.
I'll check another protein in 1B, to see if 1B exist or not.

update:
I've checked d1orsa1, strand #7 also need to be devided to 7 and 7',
so, 1B does not exist. they all belongs to 1A.