 Fibroblasts are a cell type responsible for wound healing and cell structure in animals, among a number of other relatively minor but important jobs that take place often or occasionally.The sequence and structure of pp125, when compared to National Biomedical Research Foundation and GenBank data bases, may be quite unique, meaning that it could be a new member of the protein tyrosine kinase family.This protein tyrosine kinase is up to about 70% unique compared to some other protein tyrosine kinases, a figure that is unlike those between actual members of an established protein tyrosine kinase family.