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In the experiments involving 1.5 days of drug administration, the drugs were injected at 20.00 h on the first day and at 09.00 and 20.00 h on the second day, and then the animals were killed at 09.00 h on the third day. A series of experiments, such as injection with ��E2B at 4 mg day?1 (kg water)?1, were carried out at intervals of 2�C3 days using three or four animals. Without any drug addition, CBF measured at 2�C3 day intervals [http://www.selleckchem.com/products/lee011.html LEE011 mouse] varies owing to the changes in [��E2] and [PRG] endogenously secreted depending on the stage of the ovarian cycle. However, if the administered ��E2B and mPRG were effective, CBF measured would be constant. Unfortunately, we could not measure CBF of the fimbria in ovariectomized animals. The Fallopian tube (fimbria and oviducts) adheres to the surface of the ovary (see supplemental Fig. S1). If the ovaries are removed from the animal, most of the Fallopian tube [http://www.selleckchem.com/products/mi-773-sar405838.html SAR405838 concentration] is also removed. Therefore, we could not measure CBF of ovariectomized female animals. In this study, we used the intact female guinea-pigs. All the experiments were approved by the Animal Research Committee of Osaka Medical College, and the animals were cared for in accordance with the guidelines of this committee. A fimbria was cut into small pieces (1�C2 mm blocks), which were set in a perfusion chamber, the volume of which was 30 ��l (32 mm �� 6 mm �� 0.15 mm). The chamber with tissue blocks was mounted on a heated stage (37��C) of an inverted light microscope (model T2000; Nikon, Tokyo, Japan), equipped with a high-speed camera (FASTCAM-512PCI; Photoron Ltd, Tokyo, Japan). The samples were perfused with the control solution aerated with 95% O2 and 5% CO2 at 37��C, and the perfusion rate was 300 ��l min?1. For CBF measurements, video images were recorded in 25�C35 spots from both fimbriae of an animal at 500 Hz for 2 s, and then CBF was measured using an image analysis program (DIPP-Motion 2D; DITECT, Tokyo, Japan). In a spot image, 10 cells were selected and their CBFs were measured, as shown in Fig. 1. The CBFs of 250�C300 cells were measured in an animal, and the mean rate was considered as the CBF of the animal (Fig. 2). Isolated fimbriae were used for experiments within 3 h. The statistical significance of the differences between means was assessed using Student's paired and unpaired t tests and ANOVA, as appropriate. Differences were considered [http://en.wikipedia.org/wiki/Resiquimod Resiquimod] significant at P