1. 
   An-28
   The Antonov An-28 is a Russian 19-seater aircraft designed for STOL performance from the most inaccessible 'hot and high' airstrips. It was designed in 1969.
   Found op http://www.probertencyclopaedia.com/browse/IA.HTM
   
   
2. 
   antigens, CD28
   Synonym for CD28 ... <immunology> T-cell differentiation antigens that serve as the receptors for the b7 antigen (antigens, CD80) which modulates T-cell lymphokine production. ... (12 Dec 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?antigens,+CD28
   
   

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