Of these hormone-secreting tumours, those that secrete prolactin are the most common, followed by those that secrete corticotropin and growth hormone; those that secrete sufficient gonadotropins or thyrotropin to cause clinically important hormonal abnormalities are rare.
Hormone secretion is sometimes very complex, because many endocrine glands secrete more than one hormone.
Epicyte, based in San Diego, hopes to pull off a similar trick with maize.GTC's technique is to get its animals to secrete the desired protein into their milk.
In the meantime, however, Dr Lewis had licensed his technology to Nexia, which has taken a different approach.Backed by $40m raised in an initial public offering, Nexia has been making spider-silk proteins by using genetically engineered goats that secrete the proteins into their milk.
As they do so, their salivary glands secrete hirudin, an anticoagulant so effective that the pharmaceutical industry synthesises it as a blood-thinning agent.
They came from under mattresses, behind pictures and mirrors, the roofs of pig pens or hollowed-out coconuts the myriad hiding places where ordinary Cubans secrete their savings.
The argument is that inequality causes chronic stress, and makes people secrete too much of a hormone called cortisol.
So patients equipped with such electrodes could potentially perceive a much wider range of frequencies, and with far greater precision, thereby improving their ability to understand speech and appreciate music.There are even more exotic electrodes in the pipeline, including those that secrete drugs to encourage nerve growth and even ones that stimulate nerves using an infra-red laser.
The endothelial cells that line a healthy person's blood vessels secrete substances that not only assist blood flow but also prevent the build-up of plaques dangerous clumps of protein that, if dislodged, can cause a heart attack by blocking the coronary arteries that feed blood to heart muscle.
They secrete compounds that induce a proliferation of blood vessels that feed their growth and allow them to infiltrate the walls of adjacent organs.
One day such techniques may even help doctors diagnose illnesses by scanning a portion of the skin of their patients.Given that different people tend to handle different things (and not necessarily illicit ones), and that they secrete slightly different substances, this method can even help to disentangle overlapping sets of fingerprints, which is very difficult with optical analysis alone.
