A 2005 article in Nature suggests an amended version of this, noting that if it were to hold as originally stated, molecules present would need to fall into a small range of interaction energies in order to be randomly distributed.  It contrasts with the earlier Davson-Danielli model, and it is supp
A 2005 article in Nature suggests an amended version of this, noting that if it were to hold as originally stated, molecules present would need to fall into a small range of interaction energies in order to be randomly distributed.  It contrasts with the earlier Davson-Danielli model, and it is supported by freeze-fracture electron microscopy.  Since flip-flopping is rare, it allows for distinctly different inner and outer halves, though embedded molecules are able to diffuse laterally, partially dependent on the amount of cholesterol present.  FTP name this currently accepted model of the cell membrane, in which proteins and other molecules are embedded in a freely moving phospholipid bilayer.
A 2005 article in Nature suggests an amended version of this, noting that if it were to hold as originally stated, molecules present would need to fall into a small range of interaction energies in order to be randomly distributed.  
fluid mosaic model