Interferon
Cellular (transported) proteins travels around the cell and sometimes destined to the particular organelle where it does its function. Secreted proteins such as albumin or hemogolbin are carrier proteins. Hemoglobin carries oxygen and carbon dioxide all over the body through blood tissue.
The sticky coat secreted by most animal cells is called extracellular matrix (ECM). It is composed of proteins and carbohydrates and provides structural support, adhesion, and signaling to surrounding cells. The ECM plays a crucial role in cell migration, tissue development, and maintenance of tissue integrity.
An adipokine is a cytokine secreted by adipose tissue.
leptin
Enzymes are catalytic proteins. Connective tissue is, well, tissue and is made of cells, but proteins such as collagen do play an important role. Some hormones are proteins and some are not. An example of a protein that serves as a hormone is insulin. However, hormones such as testosterone or thyroxin are NOT proteins.
muscle tissue
in tissue samples removed for a biopsy, while others are secreted into the extracellular fluid (fluid outside the cells) and may be measured in the blood.
Neurotrophins are a family of proteins that induce the survival, development and function of neurons. They belong to a class of growth factors.Neurotrophic factors are secreted by target tissue and act by preventing the associated neuron from initiating programmed cell death - thus allowing the neurons to survive.
Adiponectin is a protein homone, and is secreted from adipose (fat) tissue. No foods contain this substance.
Paracrines
growth ,energy and tissue repair
Yes; antibodies are an example.