2625675 ECTL external cavity tunable laser 4 2625672 ECTL early classification timing learning 1 2625671 ECTL electronically controlled tunable lens 1 2625674 ECTL embryonic crown-tail length 1 2625677 ECTL Environmental Chemistry and Toxicology Laboratory 1 2625673 ECTL epidermotropic cutaneous T-cell lymphoma 1 2625676 ECTL evasion of killing by cytotoxic T lymphocytes 1