What are mast cell membranes made out of? What are mast cell membranes made out of? What would weaken or strengthen them? Web searches bring up a lot of information about mast cells but very little on the membrane. And the Wikipedia page is not clear as to whether or not additional calcium or sodium fluoride would improve/weaken mast cell wall strength.

Cell membranes (not cell walls) are composed of a double layer of phospholipids. The lipids are orientated in the way, that the hydrophilic part of the molecule is oriented to the outside and the inside of the cell and the hydrophobic tail to the inside of the membrane. See the figure from the Wikipedia:

!enter image description here

Embedded in the bilayer are transport proteins, receptor and so on. Calcium and sodium fluoride have no effect on the integrity of the membrane.