... significantly r educed in ppg1 cells, in agreementwith the low glycogen levels. Interestingly, a recent large-scale yeast two -hybrid screen for protein protein interac-tions [48] has revealed the ... rcelona, Spain.E-mail: Joaquin.Arino@uab.esAbbreviations: MAP kinase, mitogen activated protein kinase; TOR,target of rapamycin; PP1, type 1 protein phosphatase; PP2A, type 2A protein phosphatase; ... phenotypes describedbelow, is aggravated by deletion of PPZ2 [10]. Ppz1functionally interacts with the protein kinase C-activatedmitogen activated protein (MAP) kinase pathway, involved in maintenance...