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For standard polymer components, the three-letter code for
the component. If there is not a standard three-letter code
for this component, or if this is a non-polymer
component, the three-letter code should be given as 'UNK'.
This code may be preceded by a '+' character to indicate
that the component is a modification of a standard
component.
alanine
ALA
arginine
ARG
asparagine
ASN
aspartic acid
ASP
ambiguous asparagine/aspartic acid
ASX
cysteine
CYS
glutamine
GLN
glutamic acid
GLU
glycine
GLY
ambiguous glutamine/glutamic acid
GLX
histidine
HIS
isoleucine
ILE
leucine
LEU
lysine
LYS
methionine
MET
phenylalanine
PHE
proline
PRO
serine
SER
threonine
THR
tryptophan
TRP
tyrosine
TRY
valine
VAL
1-methyladenosine
1MA
5-methylcytosine
5MC
2(prime)-O-methylcytodine
OMC
1-methylguanosine
1MG
N(2)-methylguanosine
2MG
N(2)-dimethylguanosine
M2G
7-methylguanosine
7MG
2(prime)-O-methylguanosine
0MG
dihydrouridine
H2U
ribosylthymidine
5MU
pseudouridine
PSU
acetic acid
ACE
formic acid
FOR
water
HOH
other
UNK