A series of molecular signals initiated by binding of a ligand to a member of the ERBB family of receptor tyrosine kinases on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. [ http://en.wikipedia.org/wiki/ErbB http://www.ncbi.nlm.nih.gov/pubmed/16460914 https://proconsortium.org/app/entry/000001812 ]