Examples:
A special character is expressed by a sequence of characters with precedent and followup '_'s. Here are some examples: 
- Ca2+ ("Ca" with "2+" superscript)
- Ca_super_2_plus__endsuper_
- Ca_super_2+_endsuper_
- G alpha beta gamma ("G" with Greek "áâãloch" subscripts)
- G_sub__alpha__beta__gamma__endsub_
- G_sub_áâãloch_endsub_
- Complex of Cdc2 and CyclinB ("Cdc2" followed by "+CyclinB" in the new line).
- Cdc2_br__plus_CyclinB
- Cdc2_br_+CyclinB
Quick Reference :
| BREAK (LINE FEED) | _br_ |
| START OF SUPERSCRIPT | _super_ |
| END OF SUPERSCRIPT | _endsuper_ |
| START OF SUBSCRIPT | _sub_ |
| END OF SUBSCRIPT | _endsub_ |
| PLUS + | _plus_ |
| MINUS - | _minus_ |
| SLASH / | _slash_ |
| UNDERSCORE _ | _underscore_ |
| SPACE | _space_ |
|
CAPITAL
|
SMALL
|
|
| GREEK LETTER ALPHA | _Alpha_ | _alpha_ |
| GREEK LETTER BETA | _Beta_ | _beta_ |
| GREEK LETTER GAMMA | _Gamma_ | _gamma_ |
| GREEK LETTER DELTA | _Delta_ | _delta_ |
| GREEK LETTER EPSILON | _Epsilon_ | _epsilon_ |
| GREEK LETTER ZETA | _Zeta_ | _zeta_ |
| GREEK LETTER ETA | _Eta_ | _eta_ |
| GREEK LETTER THETA | _Theta_ | _theta_ |
| GREEK LETTER IOTA | _Iota_ | _iota_ |
| GREEK LETTER KAPPA | _Kappa_ | _kappa_ |
| GREEK LETTER LAMBDA | _Lambda_ | _lambda_ |
| GREEK LETTER MU | _Mu_ | _mu_ |
| GREEK LETTER NU | _Nu_ | _nu_ |
| GREEK LETTER XI | _Xi_ | _xi_ |
| GREEK LETTER OMICRON | _Omicron_ | _omicron_ |
| GREEK LETTER PI | _Pi_ | _pi_ |
| GREEK LETTER RHO | _Rho_ | _rho_ |
| GREEK LETTER SIGMA | _Sigma_ | _sigma_ |
| GREEK LETTER TAU | _Tau_ | _tau_ |
| GREEK LETTER UPSILON | _Upsilon_ | _upsilon_ |
| GREEK LETTER PHI | _Phi_ | _phi_ |
| GREEK LETTER CHI | _Chi_ | _chi_ |
| GREEK LETTER PSI | _Psi_ | _psi_ |
| GREEK LETTER OMEGA | _Omega_ | _omega_ |
