RAB4A and systemic lupus erythematosus: The performance of these three methods of extraction was further compared in primary hepatocytes isolated from livers of lupus-prone mice carrying wild-type (B6.TC) or constitutively active Rab4A alleles (B6.TC/Rab4AQ72L) and mice also lacking Rab4A in T cells (B6.TC/Rab4AQ72L-KO) [55].