Chains and heterogens:
PDB Chain Sequences:
>1g18A (A:) qtpdrekalelavaqieksygkgsvmrlgdearqpisviptgsialdvalgigglprgrv ieiygpessgkttvalhavanaqaaggvaafidaehaldpdyakklgvdtdsllvsqpdt geqaleiadmlirsgaldivvidsvaalvpraelegemgdshvglqarlmsqalrkmtga lnnsgttaifinqlrdkigvmfgspetttggkalkfyasvrmdvrrvetlkdgtnavgnr trvkvvknkclapfkqaefdilygkgisregslidmgvdqglirksgawftyegeqlgqg kenarnflvenadvadeiekkikeklg
>1g18A (A:) qtpdrekalelavaqieksygkgsvmrlgdearqpisviptgsialdvalgigglprgrv ieiygpessgkttvalhavanaqaaggvaafidaehaldpdyakklgvdtdsllvsqpdt geqaleiadmlirsgaldivvidsvaalvpraelegemhvglqarlmsqalrkmtgalnn sgttaifinqltggkalkfyasvrmdvrrvetlkdgtnavgnrtrvkvvknkclapfkqa efdilygkgisregslidmgvdqglirksgawftyegeqlgqgkenarnflvenadvade iekkikeklg