Fig. 4. SEM photos showing the jaws and radula. A in Positive association between PTN polymorphisms and schizophrenia in Northeast Chinese Han population.

Fig. 4. SEM photos showing the jaws and radula. A, Overview of a jaw; B, Jaw element; C, Central teeth presented on the radula; D, Close-up image of the denticles. Scale bars: A = 500 µm; B = 20 µm; C = 500 µm; D = 20 µm.