[The frequency of sex chromatin in cells of the external hair root sheath of new born baby].
D005260:Female; D006197:Hair / Q000166:cytology*; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D009061:Mouth Mucosa / Q000166:cytology; D012728:Sex Chromatin; D013997:Time Factors