The spiral twist of the normal umbilical cord in twins and in singletons.
D005260:Female; D006801:Humans; D014376:Tuberculosis; D014384:Tuberculosis, Female Genital / Q000150:complications*; D014427:Twins; D014470:Umbilical Cord
TUBERCULOSIS, FEMALE GENITAL/complications; TWINS; UMBILICAL CORD