By-products of this process are potentially harmful molecules known as reactive oxygen species (ROS)
During strong autoimmune responses or central nervous system infections, immune cells like leukocytes, monocytes, and macrophages can cross the BBB using paracellular and transcellular routes[187]
Perilipin 1, a lipid droplet scaffold protein that coordinates interactions with ABHD5 and HSL Perilipin 1 (PLIN1), initially discovered by the group of Constantine Londos, is the major adipocyte perilipin/ADRP/TIP47 (PAT) protein (35) that functions as a scaffold to organized protein-protein interactions on the surface of LDs (36)
Critchley JA, Nimmo GR, Gregson CA et al , Inter-subject and ethnic differences in paracetamol metabolism
There are a lot of other organisms that come into play: there are a lot of GI parasites, brain parasites, worms, and amoebas of all kinds that compromise the human system