chemical signaling molecule, usually protein or steroid, secreted by endocrine cells that act to control or regulate specific physiological processes.

corticosteroid that affects ion and water balance

the cellular protein that binds to a hormone

group of non-vascular plants in which stomata appear

seedless vascular plant characterized by joints

an organism that is invaded by a pathogen or parasite

organism a parasite lives on

DNA that is present in the genome of the organism of interest

(also, homeobox gene) master control gene that can turn on or off large numbers of other genes during embryogenesis

hormone produced by the chorion of the zygote that helps to maintain the corpus luteum and elevated levels of progesterone

only bone of the arm

adaptive immune response that is controlled by activated B cells and antibodies

control of hormone release in response to changes in extracellular fluids such as blood or the ion concentration in the blood

organic material of soil; made up of microorganisms, dead animals, and plants in varying stages of decay

offspring of two closely related individuals, not of the same species