Haeckel produced several embryo drawings that often overemphasized similarities between embryos of related species. This is directly related to the practice of transferring multiple embryos at embryo transfer. Fertilized eggs become zygotes, which develop into sporophyte embryos inside the archegonia. B snurposomes are found in the amphibian oocyte nuclei and in "Drosophila melanogaster" embryos. In vitro fertilization has some issues regarding its use of embryos. She also voted in favor of research using stem cells derived from donated embryos. Further study conducted in neuronal cultures derived from presenilin-1 deficient mouse embryos. In 2001, Capito voted for a bill to ban the cloning of human embryos. Known enantiornithean fossils include eggs, embryos, and hatchlings. Controversy surrounds human ESC work due to the destruction of viable human embryos. LPD is believed to interfere with the implantation of embryos. NIH claims no support for the use of gene-editing technologies in human embryos. Limb buds develop normally in cetacean embryos. Even fossilized dinosaur embryos have been discovered. They are able to make embryos and Kimmy volunteers to be the surrogate mother.