The present invention provides a metal charged iminodiacetic acid (IDA) cellulose for detecting a test sample having a histidine tag. The present invention also provides methods for determining cloned protein expression and function. Additionally, the present invention includes a method for the handling...http://www.google.com/patents/US6232083?utm_source=gb-gplus-sharePatent US6232083 - Methods and compositions for screening cloned proteins
