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http://www3.rcsb.org/pdb/search/smart.do?chainId_0=&eCutOff_0=0.000001&sequenceIdentity_0=0.95&maskLowComplexity_0=yes&smartSearchSubtype_0=SequenceQuery&structureId_0=&target=Current&sequence_0=MEKSNETNGYLDSAQAGPAAGPGAPGTAAGRARRCAGFLRRQALVLLTVSGVLAGAGLGAALRGLSLSRTQVTYLAFPGEMLLRMLRMIILPLVVCSLVSGAASLDASCLGRLGGIAVAYFGLTTLSASALAVALAFIIKPGSGAQTLQSSDLGLEDSGPPPVPKETVDSFLDLARNLFPSNLVVAAFRTYATDYKVVTQNSSSGNVTHEKIPIGTEIEGMNILGLVLFALVLGVALKKLGSEGEDLIRFFNSLNEATMVLVSWIMWYVPVGIMFLVGSKIVEMKDIIVLVTSLGKYIFASILGHVIHGGIVLPLIYFVFTRKNPFRFLLGLLAPFATAFATCSSSATLPSMMKCIEENNGVDKRISRFILPIGATVNMDGAAIFQCVAAVFIAQLNNVELNAGQIFTILVTATASSVGAAGVPAGGVLTIAIILEAIGLPTHDLPLILAVDWIVDRTTTVVNVEGDALGAGILHHLNQKATKKGEQELAEVKVEAIPNCKSEEETSPLVTHQNPAGPVASAPELESKESVL
It has been permanently removed as part of our announced shutdown on December 9th, 2020.
See the Legacy API Shutdown December 9 announcement for further details.
Legacy APIs
If you are using one of the legacy API endpoints, you will need to migrate to the new json-based APIs.
The new APIs provide more comprehensive search and fetch capabilities, see Web Services Overview.
Documentation for the new services and migration guides are available:
Data API tutorial
Search API tutorial
Data API migration guide
Search API migration guide