[Differential gene expression during the reparative regeneration of differing polarities in planarians]

We identified two new genes (scarf and collar) of planarians using subtracting hybridization. mR-NAs of these genes are distributed in different ways in regeneration blastemas of different polarity. Zone-specific expression of these genes in non-regenerating planarians has been demonstrated. The level of expression of the identified genes in the head regeneration buds of the first-third days of regeneration was lower than that in the corresponding intact tissues and tail regeneration buds.