Related by context. Frequent words. (Click for all words.) 61 zygotes 60 neural tube defect 59 blastocyst 58 neural tube 58 fetu 57 zygote 57 teratoma 56 aneuploidy 56 blastocyst stage 56 anencephaly 56 fertilized egg 55 recessive genes 55 congenital abnormality 55 teratomas 55 congenital disorders 54 ectopic 54 developmental abnormalities 54 unfertilized 54 haploid 54 spontaneous abortions 54 ovulated 54 mesoderm 53 premature ovarian 53 ambiguous genitalia 53 fossilization 53 Spina bifida 53 lobules 53 undifferentiated cells 53 embryo 53 Gestational diabetes 53 involution 53 chromosomal abnormalities 53 uterine rupture 52 weeks gestation 52 trisomy 52 Conjoined twins occur 52 chromosome abnormalities 52 sirenomelia 52 diploid 52 genetically identical 52 epididymis 52 placental abruption 52 Embryos 52 Artificial insemination 52 germ cells 52 congenital anomalies 52 reproduce asexually 51 chromosomal abnormality 51 Multiple births 51 gamete 51 ectopic pregnancies 51 genetic abnormalities 51 delivered vaginally 51 mouse embryos 51 ovarian stimulation 51 genetic abnormality 51 pluripotent cells 51 follicle stimulating hormone 51 erythrocytes 51 vaginal cancers 51 recessive gene 50 asexual reproduction 50 irreducibly complex 50 nonsense mutation 50 placental mammals 50 congenital abnormalities 50 imprinted genes 50 blastocysts 50 mitochondrial dysfunction 50 IVF embryos 50 spermatogenesis 50 cloned embryos 50 necrotizing enterocolitis 50 intestinal tissue 50 prepubertal 50 tubal 50 nonbiological 50 congenital defects 50 unexplained infertility 49 oocyte 49 embryogenesis 49 ovulate 49 progestogen 49 ureters 49 tumor resection 49 placenta previa 49 multicellular organisms 49 cloned embryo 49 chorionic villus sampling 49 congenital malformations 49 unfertilized egg 49 born preterm 49 maternal antibodies 49 embryos 49 gametes 49 cryptorchidism 49 gestational 49 CMV infection 49 menarche 49 Uterine fibroids 49 myoblasts