Figure 1 in Chemistry supports the identification of gender-specific reproductive tissue in Tyrannosaurus rex

Figure 1. Morphological differentiation between MB and CB. (A) Mid shaft section from reproductively active laying hen femur shows textural differences between CB and MB. (B) more proximal region of hen femur shows that trabecular bone (T) can be differentiated from MB in hand sample, and that MB is deposited between trabeculae, infilling trabecular spaces. (C) MB in hand sample of ostrich femur appears to grade from CB, but can be differentiated by color and spiculation, as well as the presence of large erosion rooms (ER, arrows) at the boundary between layers. Infilling of erosion rooms with crystalline MB is also seen (*). (D) Ground section of ostrich at higher magnification shows clear separation of MB and CB. Bone fragment of MOR 1125 femur in (E) cross section and (F) medial, or medullary face orientation shows both textural and color differences between CB and MB, as well as the distinct separation between bone types. (G) Transverse section of MOR 1125 whole femur, showing almost complete infilling of the medullary cavity with MB. No gross deformation (corresponding to fracture callus) or bony expansion (corresponding to osteopetrosis) can be seen. Red line marks boundary between dense cortical bone and endosteal lamellar bone penetrated by multiple erosion rooms. Erosion rooms can be seen extending deep into the cortex in one region of the bone (*). (H) Petrographic ground section of deep CB layer and adjacent, internal MB of MOR 1125, showing change in texture and vascularity. Black arrows show distinct separation between innermost endosteal bone with erosion rooms, and region of MB deposition. Trabeculae (T) of laminar bone can be seen surrounded by MB. Scale bars as indicated.