Yes they are
immunoglobulins (antibodies)
B cells, about one-eighth of the circulating lymphocytes, mature into plasma cells. Plasma cells are responsible for the production and secretion of antibodies, soluble proteins that are also known as immunoglobulins.
immunoglobulins
Mucin
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Originate in ER which are sent to the Golgi and then are secreted through the Plasma Membrane.
Plasma is a complex solution of proteins and buffers and other stuff, it's not made of cells.
Ribosomes translate mRNA to proteins. In eukaryotic cells, the ribosomes attached to the rough endoplasmic reticulum (RER) produce proteins that are either to become part of organelles (such as lysosomes), the plasma membrane, or secreted from the cell. The free, or soluble, ribosomes found in the cytosol produce proteins that remain in the cytosol, e.g., the enzymes involved in glycolysis.
These chemicals are called CYTOKINES.
clotting proteins and cells
Antibodies are secreted (plasma cells), while immunoglobulins are membrane-bound (naive B cells).
target cells
antibodies