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Fig. 2. Allantoic dysmorphogenesis and absence of endothelialization in
TC/TC allantoises. (A-F) Hematoxylin
and eosinstained sections of allantoises (al) in +/+ (A-C) and
TC/TC (D-F) conceptuses. Mesothelial cells
(arrowheads) were observed in +/+ and TC/TC
allantoises. The dense core of +/+ allantoises (black outline, A-C) was not
clearly established or maintained in TC/TC. By
1-s, +/+ allantoises exhibited signs of endothelialization in distal regions
(inset, C, arrow), a feature that was not readily apparent in
TC/TC. Abbreviations as in
Fig. 1. Scale bar in F: 100
µm for A-F.