what does mpf stand for
Unsourced material may be challenged and removed. (September 2014). Maturation-promoting factor (abbreviated MPF, also called mitosis-promoting factor or M-Phase-promoting factor) is the cyclin-Cdk complex that was discovered first in frog eggs. It stimulates the mitotic and meiotic phases of the cell cycle. MPF promotes the entrance into mitosis (the M phase) from the G2 phase by phosphorylating multiple proteins needed during mitosis. MPF is activated at the end of G 2 by a phosphatase, which removes an inhibitory phosphate group added earlier.
Formal and informal entries are subject to a Merchandise Processing Fee (MPF). The CBP Regulations 19 CFR 24.23(b)(1) requires the importer of record to pay the fee to Customs and Border Protection (CBP) at the time of presenting the entry summary.