(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 4. The VCAM1-negative proximal region is approximately 220 µm long. The
average total lengths (in µm) of allantoises and the VCAM1-negative
proximal region from fixed ex vivo conceptuses were plotted as a function of
developmental stage of the embryo. The number of allantoises examined at each
time point is provided in the base of each bar; vertical lines at the top of
each bar represent the s.e.m. Bars with only one specimen (9-s, 11-s)
nonetheless contain errors, as measurements were the average of three
histological sections for each allantois (see Materials and methods). After
6-somite pairs, the length of the VCAM1-negative region only is indicated
because representation of the complete profile of fused allantoises was
difficult to achieve in histological sections.