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Write correct n8n expressions with double braces, proper variable syntax, and webhook data access patterns. \n \n Use {{}} syntax for all dynamic content; access current node data with $json , other nodes with $node[\"Node Name\"] , and webhook payloads from $json.body (not root) \n Node names are case-sensitive and require quotes; field names with spaces use bracket notation like $json['field name'] \n Code nodes use direct JavaScript access without {{}} braces; expressions don't work in webhoo

Retrieve gene expression experiments and multi-omics datasets with disambiguation and quality assessment.