- Lysophosphatidic acid signals through mitogen-activated protein kinase-extracellular signal regulated kinase in ovarian theca cells expressing the LPA1/edg2-receptor: involvement of a nonclassical pathway? Budnik, L.T., Brunswig-Spickenheier, B., Mukhopadhyay, A.K. Mol. Endocrinol. (2003)