Table 2 Codon usage in the 13 PCG for each of the six Ophryotrocha species investigated

AA

Codon

O. adherens

O. diadema

O. japonica

O. labronica

O. puerilis

O. robusta

STOP

UAG

0.514

0.536

0.902

0.916

0.653

0.73

UAA

1.486

1.464

1.098

1.084

1.347

1.27

Ala

GCU

1.905

1.414

2.099

1.942

1.401

1.923

GCG

0.229

0.241

0.673

0.816

0.613

0.538

GCC

0.762

1.172

0.436

0.466

0.964

0.769

GCA

1.105

1.172

0.792

0.777

1.022

0.769

Cys

UGU

1.215

1.211

1.667

1.469

1.091

1.488

UGC

0.785

0.789

0.333

0.531

0.909

0.512

Asp

GAU

1.354

1.419

1.588

1.481

1.288

1.6

GAC

0.646

0.581

0.412

0.519

0.712

0.4

Glu

GAG

0.383

0.563

1.3

1.244

0.69

1.299

GAA

1.617

1.438

0.7

0.756

1.31

0.701

Phe

UUU

1.398

1.296

1.721

1.734

1.333

1.739

UUC

0.602

0.704

0.279

0.266

0.667

0.261

Gly

GGU

0.991

0.76

1.384

1.253

1.216

1.058

GGG

1.101

1.16

1.676

1.937

1.324

1.935

GGC

0.404

0.44

0.368

0.241

0.649

0.413

GGA

1.505

1.64

0.573

0.57

0.811

0.594

His

CAC

0.703

0.869

0.75

0.44

1.119

0.563

CAU

1.297

1.131

1.25

1.56

0.881

1.438

Ile

AUU

1.561

1.343

1.689

1.726

1.357

1.691

AUC

0.439

0.657

0.311

0.274

0.643

0.309

Arg

AAA

1.514

1.72

1

1.092

1.373

1.315

AAG

0.486

0.28

1

0.908

0.627

0.685

Leu

UUG

1.109

1.574

1.104

1.252

1.435

1.097

UUA

0.66

0.503

0.466

0.417

0.609

0.602

CUA

0.547

0.529

0.687

0.712

0.609

0.581

CUC

1.684

1.394

1.742

1.62

1.348

1.72

CUG

1.58

1.555

1.17

1.268

1.381

1.346

CUU

0.42

0.445

0.83

0.732

0.619

0.654

Met

AUG

0.589

0.477

0.763

0.706

0.579

0.683

AUA

1.411

1.523

1.238

1.294

1.421

1.317

Asn

AAC

0.531

0.612

0.368

0.321

0.764

0.452

AAU

1.469

1.388

1.632

1.679

1.236

1.548

Pro

CCU

1.333

1.347

1.347

2.108

1.077

1.509

CCG

0.4

0.166

0.408

0.387

0.418

0.264

CCC

1.28

1.326

1.429

0.602

1.341

1.547

CCA

0.987

1.161

0.816

0.903

1.165

0.679

Gln

CAG

0.667

0.667

0.727

0.824

0.66

1.051

CAA

1.333

1.333

1.273

1.176

1.34

0.949

Arg

CGA

1.957

1.079

0.48

1

1.023

1.277

CGC

0.34

1.46

0.32

0.462

1.023

0.34

CGG

1.106

0.698

2.32

1.077

0.977

1.362

CGU

0.596

0.762

0.88

1.462

0.977

1.021

Ser

AGC

0.725

0.843

0.503

0.536

1.051

0.655

AGA

1.181

1.038

0.984

0.893

1.137

1.311

UCA

1.285

1.47

0.721

0.734

1.351

0.829

UCC

0.891

1.232

0.699

0.675

0.622

0.655

UCG

0.269

0.411

0.306

0.139

0.279

0.27

UCU

2.093

1.686

1.333

1.27

1.158

1.311

AGG

0.767

0.692

1.989

2.045

1.072

1.735

AGU

0.788

0.627

1.464

1.707

1.33

1.234

Thr

ACA

0.976

1.107

0.926

1.31

1.373

1.008

ACC

0.78

0.929

0.778

0.724

0.974

0.773

ACG

0.371

0.321

0.481

0.379

0.399

0.471

ACU

1.873

1.643

1.815

1.586

1.255

1.748

Val

GUC

0.374

0.44

0.251

0.362

0.429

0.488

GUG

0.604

0.734

1.103

0.993

0.667

0.882

GUU

1.295

1.394

1.743

1.678

1.548

1.795

GUA

1.727

1.431

0.903

0.966

1.357

0.835

Trp

UGA

1.4

1.302

0.93

0.896

1.209

0.743

UGG

0.6

0.698

01.07

1.104

0.791

1.257

Tyr

UAC

0.599

0.717

0.453

0.453

0.562

0.479

UAU

1.401

1.283

1.547

1.547

1.438

1.521