<prompt> Which of the following is cytophilic antibody -IgMIgAIgEIgG  <response>: IgE is an 8 S molecule. Resemble IgG structurally. Heat liable - affinity for the surface of tissue cells of the same species. homocytotropism - normal serum contains only traces of IgE a few nanograms per ml - greatly elevated levels in atopic conditions like asthma, hay fever. Reference : Anathanarayan panikers 9th edition, pg no: 98,99 p 