draw glycerol backbone
OH-CH2-CH-CH2-OH
I
OH
HEAD GROUP PHOSPHODILETHANOLAMINE
X=-CH2-CH2-NH3
HEAD GROUP PHOSPHODIYLCOLINE
X=-CH2-CH2-N+(CH3)3
PHOSPHATIDYLSERINE
X=-CH2-CH3-NH3+
I
COO-
SPHINGOLIPIDS
ON PAPER
sphingomyelin
on paper