<prompt> Parakeratosis isPremature and abnormal keratinizationIncreased formation of keratinNucleated keratinocytes in stratum corneumElongated rete ridges  <response>: Normally nucleus will be lost in keratinocytes when they reach stratum corneum.Presence of nucleated keratinocytes in stratum corneum is seen in psoriasis because of decrease in transit time - termed as parakeratosis 