下列受體的訊息傳遞，何者是活化Gq 蛋白？
\mathrm{alpha}_{2}-adrenoceptor
\mathrm{alpha}_{2}
\mathrm{beta}_{2}-adrenoceptor
\mathrm{beta}_{2}
mu-opioid receptor
\mathrm{5HT}_{2} serotonin receptor
\mathrm{5HT}_{2}
