In the science research article "Maternal alloantigens promote the development of tolerogenic fetal regulatory t cells in utero" what are some important annotations and key findings important to note?

What is the role of histocompatibility antigens in humans and where are they located?

Create a full analysis of the article: Maternal alloantigens promote the development of tolerogenic fetal regulatory T cells in utero, highlighting all necassary information, about ethics, findings, and collaborative scientific knowledge, in depth as possible?

Chimeric Antigen Receptor T cells (CAR T cells):   Question 26 options:   Are typically used to study how drugs are metabolized.   Are very potent against solid tumors but do not work well against blood cancers (e.g., leukemias).   Are derived from the blastocyst then developed into modified T cells   Are potent against some blood cancers (e.g., leukemias) but have serious side effects.   involves mutating specific amino acid residues to tryptophan, alanine, and proline