{TAIL ~ Many different compositions} for {HEAD ~ the slow release} of vaccines have been described which would be applicable to the method of the invention, for example, as described in Sanders, H. J., Chem. & Engineering News, Apr. 1, 1985, pp. 30 48 
{ TAIL ~ Many different compositions } for { HEAD ~ the slow release } of vaccines have been described which would be applicable to the method of the invention , for example , as described in Sanders , H. J. , Chem . & Engineering News , Apr. 1 , 1985 , pp . 30 48
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