Based on the provided search results, here is a synthesis of the information regarding maternal reactions and the synthesis of the matrix:

Maternal reactions and the synthesis of the matrix are important processes that occur during pregnancy and are involved in various aspects of fetal development and maternal health https://bbgate.com/media/4-mmc-mephedrone-synthesis-complete-video-tutorial.37/.

1. Maternal reactions: Maternal reactions refer to the physiological and immune responses that occur in the mother's body during pregnancy. These reactions can include immune system responses, inflammatory responses, and changes in the maternal circulation. For example, maternal-fetal immune responses play a role in protecting the developing fetus from infections and maintaining a healthy pregnancy