A specialized area of membrane of the axon terminal that faces the plasma membrane of the neuron or muscle fiber with which the axon terminal establishes a synaptic junction; many synaptic junctions exhibit structural presynaptic characteristics, such as conical, electron-dense internal protrusions, that distinguish it from the remainder of the axon plasma membrane.

nucleobase, nucleoside, nucleotide kinase activity

Catalysis of the transfer of a phosphate group, usually from ATP, to a nucleobase, nucleoside, nucleotide substrate.

A permanent cessation of all vital functions: the end of life; can be applied to a whole organism or to a part of an organism.

Catalysis of the reaction: 5-methyltetrahydrofolate + L-homocysteine = tetrahydrofolate + L-methionine.

Catalysis of the reaction: ATP + nucleoside = ADP + nucleoside monophosphate.

The stepwise addition of sugar residues to the initially added O-linked sugar (usually GalNAc) to form a core O-glycan structure.

Modulates the activity of a kinase, an enzyme which catalyzes of the transfer of a phosphate group, usually from ATP, to a substrate molecule.

The stepwise addition of sugar residues to the initially added O-linked sugar (usually GalNAc) to form the core 1 O-glycan structure, Gal-beta-1-

Modulates the activity of a phosphatase, an enzyme which catalyzes of the removal of a phosphate group from a substrate molecule.

Catalysis of the reaction: ATP + glycerol = ADP + glycerol 3-phosphate.

Any process that modulates the frequency, rate or extent of protein kinase activity.

Increases the activity of a kinase, an enzyme which catalyzes of the transfer of a phosphate group, usually from ATP, to a substrate molecule.

The process whose specific outcome is the progression of the endoderm over time, from its formation to the mature structure. The endoderm is the innermost germ layer that develops into the gastrointestinal tract, the lungs and associated tissues.

The division of an organism or part of an organism into a series of semi-repetitive parts, or segments, often arranged along a longitudinal axis.