[CONTENT] [INFRASTRUCTURE] Five more papers & db management fixes/modifications
Papers added
PMID_12504586.txt
PMID_16326979.txt
PMID_24512815.txt
PMID_27252176.txt
PMID_7964506.txt
Minor
- Additional keyword for "direct validation" records, i.e. single cell affinity measurement & sequencing
- Also fixed a bug that resulted in single-chain records having a non-zero complex id in flattened database