give birth to more than one offspring; litter-bearing

abnormal heart sound created by alteration of blood flow through the heart

an association between organisms of two different species in which each member benefits

prokaryotic organism that does not have a cell wall

Dilation of the pupil

the insulating, fatty layer, produced by Schwann cells, that surrounds the axon in some nerves

diagnostic imaging procedure, whereby contrast agent is injected into the cerebrospinal fluid

contractile protein found in muscle fibres