I setup blast against nr database/pdb (downloaded from ncbi) and I want to extract PDB id from my blast results. I used various tags from blast output format but in some entries I am not Getting PDB id.

sample of results:

gi|349951|pdb|3YPI|A            gi|349951|pdb|3YPI|A;gi|349952|pdb|3YPI|B                 349951      349951;349952                                             3YPI_A        3YPI_A          3YPI_A;3YPI_B
gi|6320255|ref|NP_010335.1|     gi|6320255|ref|NP_010335.1|;gi|136069|sp|P00942.2|...     6320255     6320255;136069;798902;1197083;45269201;151942040;1...     NP_010335     NP_010335.1     NP_010335;P00942;CAA89080;AAA88757;AAS55980;EDN603...

In first output PDB id is 3YPI. but no Pdb Id in second one. why? (I am running blast against pdb db)

Is nr db is different from PDB db?