Definition: In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
Input: iPS cells closely resemble embryonic stem cells , the " in vitro " equivalent of the part of the blastocyst ( the embryo a few days after fertilization ) which grows to become the embryo proper .
Output:
iPS cells are like embryonic stem cells from a blastocyst ( the embryo a few days after fertilization ) .