2d
acid
alanine
amino
aminoacid
arginine
asparagine
aspartic
atom
atomic
bio
biology
bond
chain
chemical
chemistry
cyclic
cysteine
element
formula
glutamic
glycine
histidine
isolated
isoleucine
leucine
lysine
medicine
model
molecular
molecule
monomer
object
organic
peptide
pharmacy
phenylalanine
proline
protein
ring
science
serine
structure
substance
symbol
tryptophan
tyrosine
valine
white