### cell:

B cell
* Most B cells situate themselves in immune organs such as the spleen and wait for their activation.
* appear to develop in a series of programmed steps.
* are a type of white blood cell that, when activated, multiply and produce antibodies
  - characterized by their surface immunoglobulins
  - involved in humoral immunity
* are lymphocytes or cells of the lymphatic system
  - that produce antibodies
* are lymphocytes that, when activated, become antibody- secreting plasma cells
  - stimulated, become antibody-secreting plasma cells
  - of course antibody producing cells
  - produced in the bone marrow
* are the antibody factories of the body and are crucial for eradication of many pathogens
  - principle agents in cell-mediated immunity
  - unable to proliferate and produce adequate antibody to contain the virus
* become fully mature plasma cells
  - plasma cells to produce antibodies
* can act as antigen-specific antigen presenting cells
  - produce seven different types of antibody, each with a distinct function
  - receive stimulation in two ways
* catch the antigen or invader and engulf it.
* circulate around the body in the blood stream.
* come from bone marrow.
* complete maturation in the bone marrow and migrate to lymphoid organs.
* complete their maturation in the bone marrow
  - structural growth and differentiation and mature in the bone marrow
* create antibodies during an immune response.
* develop from stem cells in the bone marrow.
* develop in bone marrow and produce antibodies
  - the bone marrow, hence their name
  - into plasma cells, which produce antibodies
* develope into plasma cells that produce y shaped antibodies which attach to antigens.
* fight disease by secreting antibodies into the body fluid.
* form germinal centers around follicular dendritic cells in lymphoid organs.
* go through developmental checkpoints during differentiation.
* have IgM on surface.
* make antibodies B cells start to make chemicals called antibodies.
* produce antibodies in response to immune activation of the antigen receptor.
* produce antibodies that aid in the attack against bacterial or viral infections
  - attack of bacterial or viral infections
  - destroy free-floating viruses
  - to fight the invader directly
* produce antibodies, and T cells attack foreign and virus-infected cells
  - which are secreted into the bloodstream
  - inappropriate and excessive antibodies
  - molecules called antibodies that hook on to pathogens
  - proteins called antibodies
  - several kinds of heterophile antibodies which can be tested for in screening assays
  - substances called antibodies
* recognize protein, carbohydrate and lipid antigens.
* start their life in the bone marrow as pre-B cells.
* tend to accumulate in clusters called follicles.
* work by producing, transporting, and secreting antibodies
  - chiefly by secreting soluble substances known as antibodies

### cell:

Bacterial cell
* Most bacterial cells are surrounded by a rigid cell wall that helps to protect the cell
  - have a distinctive cellular morphology
* Some bacterial cells are capable of excreting transforming DNA during certain phases of growth
  - consist of hydrophobic surfaces
  - contain gas vacuoles
  - have the ability to form spores
* are very small and can only be seen with the aid of a microscope.
* can contain thousands of ribosomes , the sites of protein synthesis
  - pick up the DNA through the process of transformation
* enter leaves and twigs through natural openings.
* have no nucleus, but animal cells do.
* outnumber human cells ten to one.