Figure 2.

The possibility that severe stress, cell loss or even ageing can induce human adult pluripotent cells both in vitro and in vivo cannot be ruled out and should warrant further investigation. A: A normal human dermal fibroblast (NHDF) cell line after 48 h of intentional CO₂ absence in the incubator. The cells modified their morphologic characteristics and adopted the culture appearance of pluripotent cells; B: Modified NHDF cells 28 d after stress; C: Non-exposed NHDF cells; D: Modified NHDF cells 73 d after stress.