Echinoderm and flatworm mitochondrial code
# Echinoderm and flatworm mitochondrial code

The echinoderm and flatworm mitochondrial code (translation table 9) is a genetic code used by the mitochondria of certain echinoderm and flatworm species.

## The code

    AAs = FFLLSSSSYY**CCWWLLLLPPPPHHQQRRRRIIIMTTTTNNNKSSSSVVVVAAAADDEEGGGG
    Starts = -----------------------------------M---------------M------------
    Base1 = TTTTTTTTTTTTTTTTCCCCCCCCCCCCCCCCAAAAAAAAAAAAAAAAGGGGGGGGGGGGGGGG
    Base2 = TTTTCCCCAAAAGGGGTTTTCCCCAAAAGGGGTTTTCCCCAAAAGGGGTTTTCCCCAAAAGGGG
    Base3 = TCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAGTCAG

Bases: adenine (A), cytosine (C), guanine (G) and thymine (T) or uracil (U).

Amino acids: Alanine (Ala, A), Arginine (Arg, R), Asparagine (Asn, N), Aspartic acid (Asp, D), Cysteine (Cys, C), Glutamic acid (Glu, E), Glutamine (Gln, Q), Glycine (Gly, G), Histidine (His, H), Isoleucine (Ile, I), Leucine (Leu, L), Lysine (Lys, K), Methionine (Met, M), Phenylalanine (Phe, F), Proline (Pro, P), Serine (Ser, S), Threonine (Thr, T), Tryptophan (Trp, W), Tyrosine (Tyr, Y), Valine (Val, V)

## Differences from the standard code

| DNA codons | RNA codons | This code (9) | Standard code (1) |
| - | - | - | - |
| AAA | AAA | Asn (N) | Lys (K) |
| AGA | AGA | Ser (S) | Arg (R) |
| AGG | AGG | Ser (S) | Arg (R) |
| TGA | UGA | Trp (W) | STOP = Ter (*) |

## Systematic range

* Asterozoa (starfishes)
* Echinozoa (sea urchins)
* Rhabditophora among the Platyhelminthes
