### cell | vegetative cell:

Cone cell
* Some cone cells are part of eyes
  - retinas.
  * They react to light and work best in relatively bright light. Cone cells are less sensitive to light than rod cells. Human eyes usually have different types of cone cells. This makes it possible to distinguish different colors. Rod cells are more sensitive to light, but cannot tell colors apart. In a publication done in 1935, Osterberg thinks that there are about 6 million cone cells in a human eye
* affect each other in complex ways.
* are also responsible for colour vision
  - densely concentrated in the macula, the center of the retina
  - for color viewing
* are less sensitive to light and function under normal and bright lighting conditions
  - mainly responsible for central and color vision
  - more sensitive to light than rod cells are
  - particularly important for color vision and discriminating fine visual detail
  - responsible for daytime color vision
* can perceive color in bright light.
* come in red, blue, and green types, the names indicating their color sensitivities.
* detect colored light.
* have a shorter, more tapered outer segment with fewer membranous disks.
* live primarily in the macula while rod cells live in the peripheral retina.
* perceive fine visual detail and discern colors.

### cell | vegetative cell:

Epithelial cell
* Some epithelial cells are specialized to produce secretions
  - have motile processes on their surfaces called cilia
* are connected through cell junctions formed by protein complexes
  - cultured and the sheets of cells fixed to an artificially made matrix
  - part of epitheliums
  - somatic cells
  - subjected to physical stress and injury
* are the cells in an organ that most often form tumors
  - hallmark of the animal body
  - main target of adenoviridae
  - thus extremely important in maintaining homeostasis
* can be flat, cuboidal, columnar, or stretchy
  - produce secretions into the surrounding environment
* come in three shapes, squamous, cuboidal or columnar.
* constitute many tissues of the fly.
* cover or line the internal organs, body surface, internal cavities and form glands.
* die as a result of lack of nutrients.
* discharge large amounts of fluids and electrolytes.
* divide and migrate over the basal layers to regenerate the epithelium.
* exhibit a rich variety of molecular interconnections.
* form a semi-permeable barrier between the body and the environment
  - important biological barriers in many different tissues and organs
* have an intrinsic apical-basal polarity.
* indicate saliva.
* ingest the bacterium, then slough off of the epithelial surface
  - thebacterium, then slough off of the epithelial surface
* line the intestine
  - lungs as well as the gastrointestinal tract, urinary tract and vagina
  - urinary tract and are normally shed into the urine
* lose the ability to incorporate fatty acids, acetate, and glucose into lipids.
* make contact with only one surface
  - up almost one-third of all the human body's cells
* migrate from the border in a leap frog fashion or in a train like fashion.
* play important defensive roles in respiratory tract and digestive tract.
* proliferate in celiac disease.
* range in shape from columnar to cuboidal to flattened squamous cells.
* reach maximum development.
* secrete a thin, watery mucus e.
* show effaced foot processes.
* start to move into the area under the scab, forming a thin layer.
* stick tight to one another.
* undergo vacuolation because of urease activity.
* use two pathways to send proteins to the cell surface.

### cell | vegetative cell | epithelial cell:

Cuboidal cell
* have more depth.
* is an epithelial cell