Chains and heterogens:
PDB Chain Sequences:
>1g18A (A:) mtqtpdrekalelavaqieksygkgsvmrlgdearqpisviptgsialdvalgigglprg rvieiygpessgkttvalhavanaqaaggvaafidaehaldpdyakklgvdtdsllvsqp dtgeqaleiadmlirsgaldivvidsvaalvpraelegemgdshvglqarlmsqalrkmt galnnsgttaifinqlrdkigvmfgspetttggkalkfyasvrmdvrrvetlkdgtnavg nrtrvkvvknkclapfkqaefdilygkgisregslidmgvdqglirksgawftyegeqlg qgkenarnflvenadvadeiekkikeklgigavvtddpsndgvlpapvdf
>1g18A (A:) qtpdrekalelavaqieksygkgsvmrlgdearqpisviptgsialdvalgigglprgrv ieiygpessgkttvalhavanaqaaggvaafidaehaldpdyakklgvdtdsllvsqpdt geqaleiadmlirsgaldivvidsvaalvpraelegemhvglqarlmsqalrkmtgalnn sgttaifinqltggkalkfyasvrmdvrrvetlkdgtnavgnrtrvkvvknkclapfkqa efdilygkgisregslidmgvdqglirksgawftyegeqlgqgkenarnflvenadvade iekkikeklg