nonredundant       
adjective  technical (also non-redundant) uk/ˌnɒn.rɪˈdʌn.dənt/ us/ˌnɑːn.rɪˈdʌn.dənt/
 无冗余的,必要的
containing or involving only what is needed in order for something to work
  We plan to develop at least one antibody to every nonredundant human protein.
 The bridge had a non-redundant design that meant that the entire span came down when one section failed. 这座桥采用了非冗余设计,这意味着当一个部分发生故障时,整座桥都会倒塌。 
 - More examples
 - The hormone has a critical and non-redundant stimulating effect on the development of lymph cells.
 - The gesture introduced a nonredundant piece of information that removed the ambiguity.
 - The parts are nonredundant, so if one breaks the whole structure can fall down.