Catalysis of the reaction: 5-valerolactone + H2O = 5-hydroxyvalerate.

Catalysis of the hydrolysis of lactone rings (intramolecular cyclic esters) to produce a hydroxyl group and a carboxyl group.

A medial cortical band overlaying the nucleus which acts as a landmark for contractile ring positioning and plays a role in cell cycle regulation.

The series of molecular signals in which a stress-activated protein kinase (SAPK) cascade relays a signal.

Flagellar filaments located in the periplasmic space; characterized in spirochetes, in which they are essential for shape and motility. Composed of a core surrounded by two sheath layers, the flagella rotate to allow migration of the cell through viscous media, which would not be possible using external flagella.

The aggregation, arrangement and bonding together of a set of components to form the spindle, the array of microtubules and associated molecules that serves to move duplicated chromosomes apart.

The process in which the generative cell divides by mitosis to form two haploid cells. These will subsequently differentiate into sperm cells.

A mitotic cell cycle process comprising the steps by which the nucleus of a eukaryotic cell divides; the process involves condensation of chromosomal DNA into a highly compacted form. Canonically, mitosis produces two daughter nuclei whose chromosome complement is identical to that of the mother cell.

A secretory organelle found in blood platelets, which is unique in that it exhibits further compartmentalization and acquires its protein content via two distinct mechanisms: (1) biosynthesis predominantly at the megakaryocyte (MK) level (with some vestigial platelet synthesis) (e.g. platelet factor 4) and (2) endocytosis and pinocytosis at both the MK and circulating platelet levels (e.g. fibrinogen (Fg) and IgG).

The process in which the antipodal cells undergo programmed cell death.

The lipid bilayer surrounding the platelet alpha granule.

The process whose specific outcome is the progression of the pollen grain over time, from its formation as the microspore to the mature structure.

The volume enclosed by the membrane of the platelet alpha granule.

Catalysis of the reaction: 5-oxovalerate + NADP+ + H2O = glutarate + NADPH + H+.

A network of membrane-bounded compartments found in blood platelets, where they regulate platelet activation by sequestering or releasing calcium. The dense tubular network exists as thin elongated membranes in resting platelets, and undergoes a major ultrastructural change, to a rounded vesicular form, upon addition of thrombin.

The interconnected cell membranes and intracellular regions of a plant. The interconnections occur via the plasmodesmata.

The lipid bilayer surrounding the platelet dense tubular network.

Differentiation of new inner ear sensory hair cells to replace those lost or destroyed by injury.

The process in which relatively unspecialized cells, acquire specialized structural and/or functional features of inner ear receptor cells. Inner ear receptor cells are mechanorecptors found in the inner ear responsible for transducing signals involved in balance and sensory perception of sound.

Differentiation of new mechanoreceptors to replace those lost or destroyed by injury.