Evolutionary aspects of the development of teeth and baleen in the bowhead whale - PubMed
Histological sections showing baleen formation. (A) Cross‐section through half of the palate of fetus
NSB‐
DWM2000B3F, showing bell‐shaped tooth germ and epithelium that will form baleen (slides P6:36). Medial to left, letters indicate approximate location of figures (B)–(G) in antibody‐stained sections of this figure. (B–D) Details of medial palatal epithelium of
NSB‐
DWM2000B3F (B, slides P6:32,
FGF‐4 stain; C, slides P6:33,
FGF‐7 stain; D, slides P6:31,
FGF‐8 stain). (E–G) Details of palatal epithelium near where baleen will form of
NSB‐
DWM2000B3F (E, slides P6:32,
FGF‐4 stain; F, slides P6:33,
FGF‐7 stain; G, slides P6:31,
FGF‐8). (H) Hair follicle of bowhead whale 2011B8 (slide 2,
FGF‐7 stain). (I) Cross‐section through half of the palate of fetus
NSB‐
DWM2009
KK1F, same orientation as (A) (slides P12:26). (J, K) Detail of Zone 2 of the palatal epithelium of
NSB‐
DWM2009
KK1F (J, slides P12:24, cross‐section; K, slides P13:47, horizontal section;
FGF‐4 stain). (L, M) Detail of Zone 3 of palatal epithelium of
NSB‐
DWM2009
KK1F with
FGF‐4 stain (L, slides P12:24, cross‐section; M, slides P6:3, parasagittal section). (N) Detail of Zone 3 of palatal epithelium of
NSB‐
DWM2009
KK1F (slides P13:78) with
FGF‐4 stain, horizontal section, labial to top. (O) Detail of Zone 2 of palatal epithelium of
NSB‐
DWM2009
KK1F (slides P12:29, cross‐section,
FGF‐8 stain). Scale bars: 0.1 mm, unless otherwise indicated.