破案了！blast建库中-parse_seqids的用意

建库的代码，加上-parse_seqids
提示

BLAST Database creation error: Near line 6001, the local id is too long. Its length is 51 but the maximum allowed local id length is 50. Please find and correct all local ids that are too long

同样的代码，去掉-parse_seqids
不再提示error

所以，该参数的用意，应该是规定序列id的长度。为何限制长度的原因还不清楚。
再看它的名字，语法- seq id