Comments (3)
(I was on holiday, so sorry for the late reply)
I originally implemented it in this way because this is what I thought the specification states should be the correct behaviour. But if many other programs do not follow this, and even RCSB ignores it then we should allow this behaviour as well. And Upon a new reading of the specification I cannot find any rules stating this should be the behaviour, this is the only rule I found:
Non-blank alphanumerical character is used for chain identifier.
Here is additional comments explaining what is commonly used:
https://biology.stackexchange.com/questions/82862/why-do-chain-identifiers-in-pdb-have-no-standard-starting-chain-id-type#:~:text=Chain%20IDs%20are%20assigned%20by%20authors%20who%20submit,identifier.%20Usually%2C%20the%20chains%20are%20assigned%20uppercase%20letters.
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From my experience, it is pretty common to have B and b, particularly when it might be in an asymmetric unit containing two biological assemblies.
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That indeed sounds like a reasonable use for them. I will merge the PR once done.
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