Ultrasound scans of twin foetuses at 26 weeks. Non-identical (dizygotic) twins develop when two separate eggs are released from the ovaries and are fertilised simultaneously. Identical (monozygotic) twins occur when the two cells formed by the first division of a fertilised egg develop independently. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Layyous, Dr. Najeeb |
Taille de l’image : | 3411 px × 2558 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |