Havran's research has been centered in T-cell, especially epidermal T-cell's. She has made many contributions in the field in understanding the role of γδ T cell at epithelial barriers and how the immune system works. Havran's research has included research in epithelial cells and how changes in these cells can trigger specific pathways affecting the immune system. This includes negative changes like inflammation due to misfolded proteins and positive changes such as avoidance of immunopathology. Havran's research found that negative impacts are due to the fact that some immune responses from foreign bodies cause cells to have negative impacts on the body. She has also investigated the role of T-cells in oily substances found in the skin. Her research found that sebum ( a hydrophobic substance secreted onto outermost layer of skin) may prevent self- reactive T-cells from being exposed to their antigens because of an epidermal skin barrier . More research is being done in this field. Some of her research also includes data on Intraepithelial γδ T cells and how they interact with epithelial cells. Epithelial cells like skin cells are the first line of defense against microorganisms and this is done with T-cells. Havran's research shows that Intraepithelial cells can help epithelial cells with
homeostasis, tissue repair, and inflammation. In mice, when there was an absence of these cells, dysregulation occurred showing that there is cross talk between epithelial cells & intraepithelial
lymphocyte's. Havran has also made significant discoveries such as that discrete γδ T cell subsets come from waves of progenitors. She also has done studies in tissue-resident dendritic epidemeral γδ T-cells that originated from the fetus and the benefits of these cells including wound healing. In addition, she has been involved in research concerning how γδ T cells can initiate a tumor- protective response. This was examined through the observation of epithelial tissues in mouse skin and the presence of T cells in immunosurveillance. == Publications ==