Up-regulation is where a cell creates more receptor due to little ligand activity. Down-regulation is the opposite. They are caused by intracelluar processes.
qurl you have a deathwish
'laissez-faire' is a French word describing the process of intervening as less as possible in the economy.
an umbella
because without order there would be no universeTechnically up and down are just names we gave...
LulzSec Calls It Quits
Facebook Takes Down Most Beautiful Teen Page
FDA Cracks Down on DIY Sperm Donor
FCC Cracks Down on Robo-Calls