#!/bin/bash
function Download(){
    PDB=$1
    wget -c -q -O "PDB/"$PDB".cif" "https://files.rcsb.org/download/"$PDB".cif"
    echo $PDB
    sleep 1s
}
export -f Download
cat SeqData.dat | cut -c 1-4 | xargs -I {} -P 10 bash -c 'Download "{}"' Provide your reponse without using the word pdb=$1.
user