The orderly movement of a cell from one site to another along a substrate such as the extracellular matrix; the migrating cell forms a protrusion that attaches to the substrate. [ http://www.ncbi.nlm.nih.gov/pubmed/11944043 http://www.ncbi.nlm.nih.gov/pubmed/14657486 https://www.worldcat.org/search?q=bn%3A0815316194 ]