d labelled

c labelled

b labelled

mass energy formula labelled

w labelled

e labelled

q labelled

t labelled

l labelled

brain cell neuron labelled

g labelled

r labelled

m labelled

i labelled

k labelled

y labelled

s labelled

j labelled

u labelled

p labelled

h labelled

neuron labelled

v labelled

n labelled