tokens: A comparison of the promoters for muMIP - 1 beta and muMIP - 1 alpha reveals a conserved CK - 1 element , but transient expression studies in RAW 264 . 7 macrophages with proximal fragments of either the muMIP - 1 beta or the muMIP - 1 alpha 5 ' promoter fused to a human growth hormone reporter gene link LPS - inducibility in both to promoter segments near to , but not identical with , the consensus CK - 1 sequence .