For each questions below, select the answer that is in the correct order. Thymocyte stages during T cell development: a) DP (double positive), CD8+, DN (double negative) b) SP (single positive), DN, DP c) CD4+, CD8+, DP d) DN, DP, SP Stages of TCR during T cell development a) TCRa, preTCR, TCRB b) preTCR, TCRa, TCRB c) preTCR, TCRB, TCRa d) TCRB, preTCR, TCRa Stages of TCR/thymocvte selection a) Positive selection, negative selection b) Negative selection, positive selection 7