-db Database name -id Unique identifier(s) or accession number(s) -format uid or acc -input Read identifier(s) from file instead of stdin Examples echo 3OQZ_a | epost -db protein | efetch -format fasta epost -db protein -id 3OQZ_a | efetch -format fasta efetch -db protein -id 3OQZ_a -format fasta echo GCF_000001405.38 | epost -db assembly | efetch -format docsum epost -db assembly -id GCF_000001405.38 | efetch -format docsum efetch -db assembly -id GCF_000001405.38 -format docsum echo PRJNA257197 | epost -db bioproject | efetch -format docsum epost -db bioproject -id PRJNA257197 | efetch -format docsum efetch -db bioproject -id PRJNA257197 -format docsum