These ligands are called chelants, chelators, chelating agents, or sequestering agents. Builders (also called chelating or sequestering agents) are water softeners. Oximes are commonly used as ligands and sequestering agents for metal ions. Secreted NGAL then limits bacterial growth by sequestering iron-containing siderophores. Phosvitins are important in sequestering calcium, iron, and other cations for the developing embryo. SeqA binds to the origin of replication, sequestering it and thus preventing methylation. While conserving water is a major element of sustainability, so is sequestering water. Tetrahydrofolate gets this extra carbon atom by sequestering formaldehyde produced in other processes. Sequestering the atmospheric carbon would likely solve the temperature problem as well. Their current status as carbon sequestering systems have thus also been reduced significantly. Restored seagrass meadows were found to start sequestering carbon in sediment within about four years. Others work by chemically or physically removing or sequestering the impurity. Mitochondria are capable of sequestering and storing some of that Ca. By sequestering the copper(I) the copper(II) is rendered a stronger oxidant. NPR-C functions mainly as a clearance receptor by binding and sequestering ANP from the circulation.