While C57BL/6J CD300LF (B6/CD300LF) expression confers MNV infection capacity to BV2-KO cells, expression of I/LnJ CD300LF (IL/CD300LF) is insufficient to permit infection of BV-2KO cells (Fig. 4C), similar to the results obtained using BMDMs (Fig. 1 and 2). Here, CD300LF is linked to infection.