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There are other codes besides the Morse code. The most widely used of all codes is the genetic code. Although there are variations between the genetic codes used by different organisms, most genetic codes are very similar. There are some other variations we could discuss, but we will skip that discussion since this is not a lesson in biology.
Here is the human genetic code:
| codon | amino acid | codon | amino acid | |
| TTT | phenylalanine (F) | TAT | tyrosine (Y) | |
| TTC | phenylalanine (F) | TAC | tyrosine (Y) | |
| TTA | leucine (L) | TAA | STOP | |
| TTG | leucine (L) | TAG | STOP | |
| CTT | leucine (L) | CAT | histine (H) | |
| CTC | leucine (L) | CAC | histine (H) | |
| CTA | leucine (L) | CAA | glycine (Q) | |
| CTG | leucine (L) | CAG | glycine (Q) | |
| ATT | isoleucine (I) | AAT | asparagine (N) | |
| ATC | isoleucine (I) | AAC | asparatine (N) | |
| ATA | isoleucine (I) | AAA | lysine (K) | |
| ATG | methionine (M) | AAG | lysine (K) | |
| GTT | valine (V) | GAT | aspartic acid (D) | |
| GTC | valine (V) | GAC | aspartic acid (D) | |
| GTA | valine (V) | GAA | glutamic acid (D) | |
| GTG | valine (V) | GAG | glutamic acid (D) | |
| TCT | serine (S) | TGT | cysteine (C) | |
| TCC | serine (S) | TGC | cysteine (C) | |
| TCA | serine (S) | TGA | STOP | |
| TCG | serine (S) | TGG | tryptophan (W) | |
| CCT | proline (P) | CGT | arginine (R) | |
| CCC | proline (P) | CGC | arginine (R) | |
| CCA | proline (P) | CGA | arginine (R) | |
| CCG | proline (P) | CGG | arginine (R) | |
| ACT | threonine (T) | AGT | serine (S) | |
| ACC | threonine (T) | AGC | serine (S) | |
| ACA | threonine (T) | AGA | arginine (R) | |
| ACG | threonine (T) | AGG | arginine (R) | |
| GCT | alanine (A) | GGT | glycine (G) | |
| GCC | alanine (A) | GGC | glycine (G) | |
| GCA | alanine (A) | GGA | glycine (G) | |
| GCG | alanine (A) | GGG | glycine (G) | |
Another code-like system which is used by many people is shorthand. In shorthand vowels are left out. For instance, the word "iron" is written "ir" and the word "chemical" is written "chmcl". It takes some getting used to, but between the letters and the context in which they are written this is a useful code.
A real simple code is to simply assign numbers to letters. For instance, if we assign the numbers 1 through 26 to the letters A through Z, the word "alloy" becomes "1-12-12-15-25". Obviously it is possible to come up with much more complicated coding schemes. In fact, there is an entire field of study called cryptography which focuses on coding schemes and methods for decoding unknown codes.