Figure 1 Portions where samples R-001, H-001 and R-006 were harvested. (a) A lateral view of a parasagittal section of the cranium from 18NPCK-M001, illustrating the localization of the nasal turbinals (marked by a white circle) within left nasal chamber. (b) An enlarged view of the ethmoturbinals I and II, positioned anterior to the cribriform plate. The highlighted region, delineated by a white line, represents the posterior end of the ethmoturbinal II. To expose its medial side, this segment is folded over. The red arrowhead denotes the site of mucosal sample R-001 extraction (enclosed by a dashed line). Additionally, in proximity to this area, histological sample H-001 was obtained. (c) A parasagittal section of the left nasal chamber from 18NPCK-M006. This section, depicted in a medial block, provides a lateral view. (d) The corresponding lateral side (in medial view) of the section shown in (c). This photograph displays two frontoturbinals. Mucosal sample R-006 was collected from the posteriormost region of the dorsal frontoturbinal (indicated by the red arrowhead). Abbr: Ca., cartilage; ET I and II, ethmoturbinal I and II, respectively; Fr., frontal bone; FT, frontoturbinal; LSC, lamina semicircularis; Na., nasal bone; Pa., palatine bone; Sp., presphenoid bone; Vo., vomer bone.