Form I is the only type of Rubisco that harbors small subunits, and it consists of eight large and eight small subunits [L8S8]: Four dimers of large subunits [L2]4 capped by four small subunits at the top and the bottom [S4]2 build the hexadecameric structure {[S4]•[L2]4•[S4] = L8S8}

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#Unit 5. Developmental Biology

Sigma neoblasts expresses soxP-2

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#Unit 5. Developmental Biology

Zeta neoblast expresses zfp-1 

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#Unit 5. Developmental Biology

Sigma neoblasts are highly proliferative and are the only stem cells directly responsive to injury.

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#Unit 5. Developmental Biology

Sigma neoblasts generate a huge variety of cell types, as well as the progenitor population for zeta neoblasts.

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#Unit 5. Developmental Biology

Zeta neoblasts give rise to epidermal cell fates through a prog-1-positive postmitotic precursor state.

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#Unit 5. Developmental Biology

Loss of the zeta population 

Epidermal cell types do not fully regenerate in the absence of zeta neoblasts, the remaining neoblasts (likely sigma) and their derived cell types are unaffected.