An essential amino acid that is a precursor to serotonin and melatonin, involved in the regulation of mood and sleep.

Abbreviation for Thiamine pyrophosphate, a coenzyme form of thiamine (vitamin B1) involved in carbohydrate metabolism.

A cell that forms part of the pollen tube in plants, facilitating the passage of male gametes to the ovule…

Small, flexible, tube-like structures in echinoderms (e.g., starfish), used for locomotion, feeding, and attachment to surfaces.

The nucleus of the pollen tube in plants, which controls the growth and guidance of the tube during fertilization.

A swollen underground organ of a plant, typically a stem or root, that stores food reserves and can give rise…

A type of free-swimming larva found in some invertebrates, characterized by a band of cilia around its body used for…

A term used to describe an early human or ape-like species, often referring to cave dwellers or archaic humans.

Relating to feeding or nutrition, typically used to describe the position of an organism within a food chain.

A regulatory protein complex involved in muscle contraction, which interacts with tropomyosin to allow or prevent the binding of myosin…