Table 1 Distribution of CDK and cyclin family proteins in representative organisms

Homo sapiens

Vertebrata

20

29

Ciona intestinalis

Urochordata

10

14

Strongylocentrotus purpuratus

Echinodermata

11

14

Branchiostoma floridae

Cephalochordata

12

16

Drosophila melanogaster

Arthropoda

11

14

Nematostella vectensis

Cnidaria

12

16

Trichoplax adhaerens

Placozoa

14

14

Amphimedon queenslandica

Porifera

11

13

Monosiga brevicollis

choanoflagellata

10

8

Salpingoeca rosetta

choanoflagellata

6

8

Capsaspora owczarzaki

Filasterea

9

10

Sphaeroforma arctica

Ichthyosporea

3

9

Saccharomyces cerevisiae

Fungus

6

15

Schizosaccharomyces pombe

Fungus

7

11

Coprinopsis cinerea

Fungus

7

9

Spizellomyces punctatus

Fungus

8

8

Thecamonas trahens

Apusoza

7

9

Dictyostelium discoideum

Amoeboza

8

9

Total

172

226