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Transillumination patterns of seminiferous tubules in two species of Australian rodents, Pseudomys australis and Notomys alexis.

The transillumination-assisted isolation of segments of seminiferous tubules in defined stages of the wave of the seminiferous epithelium was investigated in Pseudomys australis and Notomys alexis. In P. australis, three different transillumination patterns (pale, spotty and dark) of the seminiferous tubules could be isolated. They corresponded to histological stages 1-2, 3-5 and 6-8 of the wave of the seminiferous epithelium. The dark pattern made up about 40% of the wave, the pale pattern about 31%, and the spotty pattern about 24%. In N. alexis, no such isolation of segments with particular cell associations was possible. In a comparison of P. australis with the laboratory rat, the dark, pale and spotty transillumination patterns of seminiferous tubule segments corresponded to the same cell associations in both species, but the length of the spotty segments in the laboratory rat made it possible to subdivide the spotty region into pale spotty and dark spotty areas and thus to isolate four different transillumination patterns. Further separation into other subgroups to isolate additional types of segments could not be performed repeatedly in any of the studied species because of the gradual change of one subgroup of transillumination pattern into another and the short length of some of the subgroups.