use ~ as a delimiter instead of .
use ~ as a delimiter instead of .

NCBI-Hackathons/Cancer_Epitopes_CSHL,NCBI-Hackathons/Cancer_Epitopes_CSHL,NCBI-Hackathons/Cancer_Epitopes_CSHL,NCBI-Hackathons/Cancer_Epitopes_CSHL,NCBI-Hackathons/Cancer_Epitopes_CSHL