Abstract
A novel cysteine proteinase, cathepsin-6, was isolated by RNA differential display from mouse placenta. Cathepsin-6 showed the highest homology with cathepsin J (same as P) and L. The structural features including the catalytic triad of the C1 proteinase family were well conserved in cathepsin-6. The expression of cathepsin-6 and cathepsin J/P was restricted in labyrinthine trophoblasts of the placenta.
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