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Biology of Reproduction, Vol 13, 499-504, Copyright © 1975 by Society for the Study of Reproduction
1 Department of Anatomy,
University of California,
San Francisco, California 94143 We have used 17 day pregnant Long-Evans rats to demonstrate, utilizing indirect fluorescent
antibody methods, that relaxin is present in luteal cells of the ovary. Furthermore, this technique
revealed that the highest concentration of relaxin is localized in the juxtanuclear area of the cell,
presumably over the Golgi region. The role of granular cells of the uterine metrial gland as a source of relaxin in the pregnant rat is
still not clarified. Using the indirect fluorescent antibody technique only one experiment out of six
demonstrated the presence of relaxin in the granular cells of the metrial gland. However, other
investigators claim to have localized relaxin in these granular cells by the fluorescent antibody
technique. Failure to obtain such consistent results in our studies may have been a result of low
concentrations of relaxin in the granular cells and/or the presence of an immunochemically
different relaxin molecule in these cells.
Accepted on August 8, 1975
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