A recombinant vector comprises simian adenovirus SAdV-39, -25.2, -26, -30, -37, and -38 sequences and a heterologous gene under the control of regulatory sequences. A cell line which expresses simian adenovirus SAdV-39, -25.2, -26, -30, -37, and -383 gene(s) is also disclosed. Methods of using the vectors and cell lines are provided.