(a)
(b)
(c)
(d)
Figure 1: Levels of soluble (s)HLA-G (a) and sHLA-E (b) have been analyzed in BM plasma samples from NB patients (grey circles) and healthy BM donors (white circles). Horizontal lines indicated medians. Results are expressed as ng/ml (sHLA-G) or arbitrary units (U)/ml (sHLA-E). Correlation between BM plasma levels of sHLA-G and sHLA-E have been analyzed in NB patients (c) and controls (d). Linear regression of data and r and p values are indicated.